The best mini split air conditioners balance room-appropriate capacity, efficient heating and cooling, and an installation setup that fits your home. My best overall pick is the Temprium 12,000 BTU, 22 SEER2 system, which pairs high listed efficiency with Wi-Fi and 115V power. For smaller rooms, the Senville LETO 9,000 BTU is a lower-capacity alternative, while the Rellytech 18,000 BTU suits buyers who need more output and have compatible 208–230V service. The main tradeoffs are sizing, electrical requirements, efficiency claims, and the cost and complexity of professional installation. Read on for the full comparison and a guide to choosing a system that matches your space.
Get home appliances delivered free with Prime
- Fast, free delivery on millions of items
- Prime Video, Amazon Music and more included
- Member-only deals all year
Complete the kit
Key Takeaways
- Temprium’s 12,000 BTU, 22 SEER2 listing gives it the strongest stated efficiency among the 12,000 BTU models here, alongside Wi-Fi and 115V power; confirm the full system specifications before buying.
- Capacity and voltage narrow the field quickly: the Senville LETO and Rellytech 9,000 BTU models target smaller spaces, while Rellytech’s 18,000 BTU model calls for 208–230V service.
- Efficiency claims vary even at the same capacity. Several 12,000 BTU listings specify 18–20 SEER2, so compare complete model documentation rather than assuming similar output means similar running costs.
- Brand and model range matter when comparing options. Senville LETO appears in 9,000, 12,000, and 24,000 BTU versions, while Rellytech spans several capacities and listed efficiency levels.
- Included installation materials do not remove installation requirements. The Rellytech 9,000 BTU listing names an installation kit, but electrical work, permits, refrigerant handling, and local code still need to be checked.
| mini split air conditioner | Noise level | Voltage | Efficiency | Warranty |
|---|---|---|---|---|
| Rellytech 11,500 BTU 17 SEER2 | As low as 29 dB | — | 17 SEER2 | 5-year limited |
| Albott 12,000 BTU Mini Split A | Below 29 dB | 115V | 18 SEER2 | 5-year compressor; 7-year parts |
| YITAHOME 12,000 BTU 115V Mini- | Below 41 dB | 115V | 20 SEER2 | — |
| Senville LETO Mini Split Air C | — | — | — | 5 years parts; 5 years compressor |
| Tehanld 12000 BTU Mini Split A | — | 115V | 17 SEER2 | — |
| COSTWAY 12,000 BTU Mini-Split | 23 dB | — | — | 5 years parts; 8 years compressor |
| Rellytech 12,000 BTU Mini Spli | 42 dB | 115V/110V | 19 SEER2; HSPF2 8.5 | 8 years |
| Temprium 12000 BTU Mini Split | 23 dB | 115V | 22 SEER2 | 1 year |
| MEPTY 12,000 BTU Mini Split Ai | As low as 26 dB | 115 volts | — | — |
| Rellytech Mini Split AC/Heatin | 42 dB | 115V | 19 SEER2 | 8 years |
| Senville LETO 12,000 BTU Mini | 28 dB | 110 volts | — | 5 years on parts and compressor |
| Rellytech Mini Split AC Heatin | — | 208–230 V | 19 SEER2 | — |
| COSTWAY 12,000 BTU Mini Split | As low as 28 dB | 115 V | 20 SEER2 | — |
| Garvee 12,000 BTU Mini-Split A | 23 dB | 115 V | 19 SEER2 | Listing mentions 5 years; product details list 1 year |
| Senville LETO Mini Split Air C | 34 dB | 220 V | — | 5 years on parts and compressor |
More Details on Our Top Picks
Rellytech 11,500 BTU 17 SEER2 Ductless Mini Split Air Conditioner and Heater
The Rellytech makes the most sense for a bedroom, office, or other space where low operating noise matters more than maximum coverage. Its 11,500 BTU capacity is rated for up to 550 square feet, making it a more focused choice than the 12,000 BTU Albott or YITAHOME models, each rated for up to 750 square feet. The standout is its stated 29 dB minimum noise level, paired with remote temperature sensing and 4D airflow to help distribute conditioned air around the room. It also heats down to -4°F, a colder stated heating limit than the Albott and YITAHOME, which list 5°F. The tradeoff is a 17 SEER2 rating and installation that needs hardwiring and refrigerant line vacuum-pumping; the included kit does not make this a plug-in project.
Pros:- Rated for quiet operation as low as 29 dB, suitable for noise-sensitive rooms.
- Provides cooling, heating, dehumidification, and fan circulation.
- Heating operation is specified down to -4°F.
- Includes 4D airflow, self-cleaning, and a washable filter.
Cons:- 17 SEER2 is lower than the Albott’s stated 18 SEER2 and YITAHOME’s 20 SEER2.
- Requires hardwiring and vacuum-pumping, so professional HVAC installation is strongly recommended.
- Power cord is not included, and the two packages may arrive separately.
Best for: Owners of bedrooms or home offices up to about 550 square feet who want quiet cooling, heating, and dehumidification and can arrange professional installation.
Not ideal for: Buyers cooling a larger open area or looking for a straightforward DIY setup; this model has a smaller stated coverage area and requires hardwiring and specialist installation work.
- Capacity:11,500 BTU
- Efficiency:17 SEER2
- Coverage:Up to 550 sq. ft.
- Power:115V, hardwired
- Noise level:As low as 29 dB
- Refrigerant:R32
- Operating limits:Heating down to -4°F; cooling up to 122°F outdoor temperature
- Included:16.42 ft copper line set and installation kit; power cord not included
- Warranty:5-year limited
Our verdict“Choose the Rellytech for quiet, year-round comfort in a smaller room if you are prepared to pay for proper hardwired installation.”
Albott 12,000 BTU Mini Split Air Conditioner and Heater, SEER2 18, 115V
The Albott pairs a 12,000 BTU output with a stated coverage area of up to 750 square feet, giving it a broader room-size target than the 550-square-foot Rellytech 11,500 BTU. Its 18 SEER2 rating also sits between that Rellytech and the YITAHOME’s stated 20 SEER2, making this a balanced option rather than the efficiency leader. Noise below 29 dB and removable filters make it appealing for occupied living areas where quiet operation and routine upkeep both matter. It handles cooling, heating, dehumidifying, and fan operation, though its listed operating range begins at 5°F—less cold-weather reach than the Rellytech. The temperature controls are limited to 61°F–90°F, and the 750-square-foot figure should not be treated as a guarantee for rooms with poor insulation or challenging layouts.
Pros:- 18 SEER2 efficiency rating exceeds the Rellytech 11,500 BTU model’s 17 SEER2.
- Rated for up to 750 square feet, more coverage than the smaller Rellytech.
- Quiet operation below 29 dB.
- Includes self-cleaning functions, removable filters, and a 7-year parts warranty.
Cons:- Heating operating range starts at 5°F, warmer than the Rellytech’s stated -4°F limit.
- Temperature settings are restricted to 61°F–90°F.
- The stated coverage area may not suit spaces with high heat loss or complex layouts.
Best for: Households seeking a quiet 12,000 BTU system for a medium-sized room or open area, with removable filters and a longer parts warranty.
Not ideal for: Buyers who need heating below 5°F or want temperature settings outside the listed 61°F–90°F range.
- Capacity:12,000 BTU
- Efficiency:18 SEER2
- Coverage:Up to 750 sq. ft.
- Voltage:115V
- Noise level:Below 29 dB
- Operating range:5°F to 122°F
- Temperature settings:61°F–90°F
- Warranty:5-year compressor; 7-year parts
Our verdict“Pick the Albott for quiet comfort across a larger room when its 5°F heating limit and restricted temperature settings fit your needs.”
YITAHOME 12,000 BTU 115V Mini-Split Air Conditioner and Heat Pump
The YITAHOME stands apart from the Albott and Rellytech by putting Wi-Fi, app, and voice controls at the center of its appeal. That makes it a natural fit for buyers who want to adjust a room remotely or connect climate control to a smart-home routine. Its 20 SEER2 rating is the highest stated efficiency in this group, while its 12,000 BTU capacity is listed for spaces up to 750 square feet. It also offers inverter operation, auto-clean, dehumidification, and five modes. The compromise is noise: the listed level is below 41 dB, not as low as the Albott’s below-29-dB claim or the Rellytech’s 29 dB minimum. Like those systems, it needs professional installation, and its 5°F lower operating limit does not match the Rellytech’s colder heating specification.
Pros:- 20 SEER2 is the highest stated efficiency rating among these five products.
- Offers app, remote, and voice control.
- Combines cooling, heating, dehumidification, and five operating modes.
- Washable, removable filter and auto-clean feature support routine maintenance.
Cons:- Noise is specified below 41 dB, higher than the Albott’s below-29-dB and Rellytech’s 29 dB minimum claims.
- Heating operating range begins at 5°F, not as low as the Rellytech or Tehanld specifications.
- Requires installation by a licensed HVAC professional, and both cartons must be available.
Best for: Smart-home users who want app or voice access to heating and cooling in a space up to 750 square feet.
Not ideal for: Noise-sensitive sleepers who prioritize the lowest stated sound level, or households needing heat below 5°F.
- Capacity:12,000 BTU
- Efficiency:20 SEER2
- Coverage:Up to 750 sq. ft.
- Voltage:115V
- Noise level:Below 41 dB
- Operating range:5°F to 118°F
- Refrigerant:R-32
- Controls:App, remote, and voice control
- Dimensions and weight:7.9 × 31.2 × 11.5 in (D × W × H); 57.8 lb.
Our verdict“Choose the YITAHOME if smart controls and its 20 SEER2 rating matter more to you than the lowest stated noise level or colder-weather reach.”
Senville LETO Mini Split Air Conditioner Heat Pump White 9000 BTU
With 9,000 BTU of capacity, the Senville LETO is the smaller-room choice in this batch, not a substitute for the 12,000 BTU Albott, YITAHOME, or Tehanld when the space needs more output. Its four functions—cooling, heating, dehumidifying, and fan—cover the basics, while UL listing and AHRI certification provide useful documentation for buyers comparing system credentials. Alexa integration and a DC inverter add convenience, and the package includes a 16-foot line set with refrigerant charge for up to 25 feet of line. Its stated heating limit of 5°F is not as low as the Rellytech or Tehanld’s -4°F specification. Professional installation is required, and the package does not include labor, so the included kit should not be mistaken for a complete DIY installation.
Pros:- Smaller 9,000 BTU capacity suits a more modest cooling and heating zone than the 12,000 BTU options.
- UL listed and AHRI certified.
- Includes cooling, heating, dehumidification, and fan functions with Alexa integration.
- Package includes a 16-foot line set and refrigerant charge for up to 25 feet of line.
Cons:- Lower capacity than the Albott, YITAHOME, and Tehanld, limiting its fit for larger spaces.
- Heating limit is 5°F, warmer than the -4°F specifications listed for the Rellytech and Tehanld.
- Requires professional installation, and labor is not included.
Best for: Buyers outfitting a smaller room who want a 9,000 BTU system with stated UL and AHRI credentials, Alexa support, and an included line set.
Not ideal for: People conditioning a large or poorly insulated area, or anyone expecting a DIY installation or heating below 5°F.
- Capacity:9,000 BTU
- Color:White
- Inverter:DC inverter
- Heating limit:Down to 5°F (-15°C)
- Certifications:UL listed; AHRI certified
- Included components:Indoor air handler, outdoor condenser, remote, 16-ft line set, communication wire
- Refrigerant line capacity:Factory charge supports up to 25 ft of line set
- Warranty:5 years parts; 5 years compressor
Our verdict“The Senville LETO is a sensible fit for a smaller zone when certifications and smart-home compatibility outweigh higher capacity or colder-weather heating.”
Tehanld 12000 BTU Mini Split Air Conditioner and Heat Pump System
The Tehanld’s clearest advantage over the Albott and YITAHOME is its stated ability to operate down to -4°F, giving it a better-listed cold-weather range for homes that need heat through colder spells. Its 12,000 BTU capacity is rated for up to 750 square feet, matching those two models’ stated coverage, while the 17 SEER2 rating trails both. Sleep, Quiet, Turbo, and ECO modes give users ways to prioritize comfort or operation, and the kit includes 9.8 feet of copper piping. That shorter included line set may constrain placement compared with the Senville LETO’s 16-foot line set. The product data lists UL and DOE certifications, but installation still calls for a licensed HVAC professional, and the two-package shipment can complicate scheduling.
Pros:- Stated operating limit down to -4°F, colder than the Albott and YITAHOME’s 5°F lower limits.
- 12,000 BTU capacity and stated coverage up to 750 square feet.
- Includes Sleep, Quiet, Turbo, and ECO modes.
- R32 refrigerant, 115V power, and listed UL and DOE certifications.
Cons:- 17 SEER2 is below the Albott’s 18 SEER2 and YITAHOME’s 20 SEER2.
- Included copper piping is 9.8 feet, shorter than the Senville LETO’s 16-foot line set.
- Requires licensed HVAC installation, and the system ships in two packages.
Best for: Households in colder regions seeking a 12,000 BTU mini split with a stated -4°F operating limit for spaces up to 750 square feet.
Not ideal for: Buyers prioritizing a higher stated efficiency rating or needing a longer included line set for flexible equipment placement.
- Capacity:12,000 BTU
- Efficiency:17 SEER2
- Voltage:115V
- Coverage:Up to 750 sq. ft.
- Refrigerant:R32
- Operating limit:Down to -4°F
- Modes:Cool, Heat, Auto, Fan, Dry
- Included piping:9.8 ft copper piping
- Certifications:UL, DOE
Our verdict“Pick the Tehanld when its -4°F operating specification matters more than higher efficiency or a longer included line set.”
COSTWAY 12,000 BTU Mini-Split Air Conditioner and Heater
I’d shortlist the COSTWAY 12,000 BTU for a bedroom or living space where quiet operation and straightforward heating and cooling matter more than app controls. Its listed 23 dB noise level is much lower than the Rellytech 12,000 BTU’s 42 dB rating, while inverter operation and ECO and sleep modes offer ways to moderate use. The washable filter and self-cleaning function also reduce routine upkeep, and auto-defrost supports heating operation in cold weather.
The tradeoff is the installation commitment: this system requires a licensed HVAC installer and a new compatible outdoor unit. Unlike the WiFi-enabled Temprium, it has no listed app or voice control. I’d also verify outdoor-unit compatibility before buying rather than assume an existing unit will work. Its parts and compressor warranty terms are clearly specified, but the listed warranty periods differ by component.
Pros:- Listed 23 dB operation is quieter than the Rellytech 12,000 BTU’s 42 dB rating.
- Heating and cooling, with inverter operation and ECO and sleep modes.
- Washable filter, self-cleaning function, and auto-defrost support routine care and heating use.
- Remote control and specified parts and compressor warranty periods.
Cons:- Requires licensed HVAC installation.
- Requires a new compatible outdoor unit.
- No app or voice controls are listed.
Best for: Homeowners prioritizing quiet, remote-controlled heating and cooling in a room suited to a 12,000 BTU system, with access to professional installation.
Not ideal for: Renters, DIY installers, or smart-home buyers who want app and voice controls or need to reuse an existing outdoor unit.
- Cooling power:12,000 BTU
- Functions:Cooling and heating
- Noise level:23 dB
- Refrigerant:R-32
- Inverter:Yes
- Filter:Washable
- Dimensions:9 × 44.5 × 13 in (D × W × H)
- Warranty:5 years parts; 8 years compressor
- Installation:Licensed HVAC installer required
Our verdict“Choose the COSTWAY if quiet operation and basic heat-pump features matter more than smart controls and you can arrange professional installation.”
Rellytech 12,000 BTU Mini Split Air Conditioner and Heat Pump
The Rellytech 12,000 BTU is a sensible fit for buyers who want a clearly stated coverage target and certification details alongside heating and cooling. It is rated for up to 750 sq. ft., with 12,500 BTU heating capacity, ETL and AHRI certifications, and a 19 SEER2 efficiency figure. The 24-hour timer, Eco and Sleep modes, and adjustable airflow give households practical scheduling and comfort controls without relying on a listed app.
Compared with the COSTWAY 12,000 BTU, Rellytech publishes a coverage area and certification information, but its 42 dB noise rating is substantially higher than COSTWAY’s listed 23 dB. That makes COSTWAY a stronger candidate for noise-sensitive rooms. Rellytech still requires professional HVAC installation, and the supplied details do not specify refrigerant or whether an outdoor unit is included. I’d confirm both before ordering.
Pros:- Rated for spaces up to 750 sq. ft.
- Provides 12,000 BTU cooling and 12,500 BTU heating.
- ETL and AHRI certifications and stated 19 SEER2 efficiency.
- Includes Eco and Sleep modes, a 24-hour timer, and adjustable airflow.
Cons:- Listed 42 dB operation is louder than the COSTWAY and Temprium options’ 23 dB ratings.
- Professional HVAC installation is required.
- The provided product details do not specify refrigerant or outdoor-unit inclusion.
Best for: Homeowners seeking a certified 12,000 BTU heat pump for a space near the stated 750 sq. ft. coverage, with timer and airflow controls.
Not ideal for: Light sleepers prioritizing very low listed indoor noise, or buyers who need detailed outdoor-unit and refrigerant information before purchase.
- Cooling capacity:12,000 BTU
- Heating capacity:12,500 BTU
- Coverage area:Up to 750 sq. ft.
- Efficiency:19 SEER2; HSPF2 8.5
- Voltage:115V/110V
- Noise level:42 dB
- Vertical swing:90°
- Certifications:ETL and AHRI
- Warranty:8 years
Our verdict“Pick this Rellytech for stated 750 sq. ft. coverage and certifications, but choose a quieter-listed model for a noise-sensitive bedroom.”
Temprium 12000 BTU Mini Split Air Conditioner & Heat Pump, 22 SEER2, 115V, WiFi Enabled
For buyers who want a mini split that joins a connected home, the Temprium 12,000 BTU has the most complete control mix here: app, remote, and Alexa or Google Assistant operation. Its 22 SEER2 rating is higher than the 19 SEER2 figures listed for the Rellytech and MEPTY models, giving efficiency-minded shoppers a useful point of comparison. A 23 dB noise rating, washable filter, and self-cleaning feature also suit rooms where quiet running and simpler upkeep are priorities.
Its 115V supply and stated coverage of up to 750 sq. ft. will suit some installations, but not every electrical setup or room layout. The biggest compromise is the one-year warranty, shorter than Rellytech’s listed eight years. It also requires a new outdoor unit. Compared with the COSTWAY, Temprium adds smart controls and a higher stated efficiency rating, but offers less warranty coverage.
Pros:- 22 SEER2 stated efficiency rating with DC inverter technology.
- App, remote, and Alexa or Google Assistant controls.
- Listed 23 dB noise level and coverage up to 750 sq. ft.
- Self-cleaning feature and washable filter.
Cons:- One-year warranty is shorter than the Rellytech 12,000 BTU’s stated eight-year warranty.
- Requires a new outdoor unit.
- 115V power requirement may not suit every electrical setup.
Best for: Smart-home owners seeking app and voice control, quiet operation, and a higher stated efficiency rating in a 115V installation.
Not ideal for: Buyers who need a longer stated warranty, cannot use 115V power, or expect to connect the system to an existing outdoor unit.
- Cooling capacity:12,000 BTU
- Heating capacity:12,300 BTU
- Efficiency:22 SEER2
- Voltage:115V
- Wattage:780 watts
- Coverage area:Up to 750 sq. ft.
- Noise level:23 dB
- Controls:App, remote, and Alexa/Google Assistant voice control
- Warranty:1 year
Our verdict“Choose the Temprium if smart controls and its 22 SEER2 rating outweigh the short listed warranty and 115V limitation.”
MEPTY 12,000 BTU Mini Split Air Conditioner and Heat Pump
The MEPTY 12,000 BTU keeps its feature set uncomplicated: heating and cooling, fan and dehumidifying modes, adjustable fan speeds, a remote, and a 24-hour timer. With stated coverage of up to 750 sq. ft. and noise as low as 26 dB, it offers a straightforward alternative to the Temprium, which adds app and voice control and lists a lower 23 dB noise level. MEPTY’s appeal is its basic, practical control package rather than connected features.
The listed 19 SEER2 efficiency is below Temprium’s 22 SEER2, and the product details provide no certification or warranty information. The listing also describes a split-system installation with an outdoor unit required, so this is not a plug-in replacement for a window unit. I’d confirm installation requirements and warranty coverage with the seller before choosing it over options with more complete published details.
Pros:- Cooling, heating, fan, and dehumidifying modes.
- Coverage stated up to 750 sq. ft.
- Noise as low as 26 dB.
- Remote control, four fan speeds, and a 24-hour timer.
Cons:- Requires split-system installation and an outdoor unit.
- Its stated 19 SEER2 rating is below the Temprium’s 22 SEER2.
- Warranty and certification details are not provided in the supplied product data.
Best for: Buyers wanting a 12,000 BTU heating and cooling system with a remote and timer, without needing app or voice controls.
Not ideal for: Smart-home users, buyers seeking a stated longer warranty or certifications, and anyone unable to accommodate a split-system outdoor unit.
- Cooling capacity:12,000 BTU
- Voltage:115 volts
- Wattage:1,100 watts
- Noise level:As low as 26 dB
- Coverage:Up to 750 sq. ft.
- Refrigerant:R32
- Modes:Cooling, heating, fan, and dehumidifying
- Controls:Remote control; 24-hour timer
- Dimensions:11.93 × 32.28 × 8.23 in
Our verdict“Choose MEPTY for basic remote-and-timer operation, but favor Temprium if efficiency figures and smart controls are higher priorities.”
Rellytech Mini Split AC/Heating System – 19 SEER2 9000 BTU Inverter Ductless Air Conditioner with Heating, 115V, Up to 550 sq ft, 24H Timer, Installation Kit
At 9,000 BTU and a stated coverage limit of up to 550 sq. ft., this Rellytech is the size-conscious pick for a smaller room where a 12,000 BTU system may be more capacity than the space calls for. It includes heating and cooling, four fan speeds, a 90-degree vertical swing, ECO mode, and a 24-hour timer. The stated 19 SEER2 efficiency also matches the larger Rellytech 12,000 BTU, while its lower capacity makes it a more targeted option for compact spaces.
That smaller capacity is also the main limitation: it is not the better fit for rooms approaching the 750 sq. ft. coverage claimed for the 12,000 BTU Rellytech, Temprium, and MEPTY models. Its 42 dB noise rating is higher than the 23 dB COSTWAY and Temprium ratings. Professional HVAC installation is required despite the title’s mention of an installation kit, so I’d confirm what that kit contains before purchase.
Pros:- 9,000 BTU capacity is aimed at smaller spaces up to 550 sq. ft.
- Provides both cooling and heating with four fan speeds.
- 19 SEER2 rating, ECO mode, and a 24-hour programmable timer.
- ETL and AHRI certified, with a stated eight-year warranty.
Cons:- Coverage is limited to the stated maximum of 550 sq. ft.
- 42 dB listed noise level is higher than several 12,000 BTU options in this roundup.
- Professional HVAC installation is required; installation-kit contents are not specified in the supplied data.
Best for: Homeowners fitting a smaller room up to the stated 550 sq. ft. coverage who want heating, cooling, a timer, and a stated eight-year warranty.
Not ideal for: Buyers cooling larger open spaces or those prioritizing the lowest listed noise level; the 12,000 BTU COSTWAY and Temprium list 23 dB.
- Cooling capacity:9,000 BTU
- Heating capacity:9,000 BTU
- Coverage area:Up to 550 sq. ft.
- Efficiency:19 SEER2
- Voltage:115V
- Noise level:42 dB
- Fan speeds:High, medium, low, auto
- Vertical swing:90°
- Warranty:8 years
Our verdict“Pick this Rellytech for a smaller room within its stated coverage, not as a substitute for a 12,000 BTU system in a larger space.”
Senville LETO 12,000 BTU Mini Split Air Conditioner and Heat Pump
The 12,000-BTU Senville LETO is a good fit for buyers who want one system for cooling, heating, dehumidifying, and fan operation, with Alexa and app control adding convenience beyond a basic remote. Its 110-volt requirement can suit homes where a 208–230-volt unit like the Rellytech 18,000-BTU system is not a match, though capacity is lower and the Rellytech is intended for larger areas. Senville includes a 16-foot line set and installation kit, which helps with planning the job but does not make this a DIY installation: professional installation is required. The listed 28-dB noise level and heating operation down to 5°F add flexibility for bedrooms and shoulder-season use. The main compromise is ownership cost uncertainty: the five-year parts and compressor warranty excludes labor, so installation or repair work remains the buyer’s responsibility.
Pros:- Combines cooling, heat pump, dehumidifier, and fan modes.
- Supports Alexa and app control as well as a remote.
- Includes indoor and outdoor units with a 16-foot line set and installation kit.
- Five-year parts and compressor warranty.
Cons:- Professional installation is required.
- Warranty excludes labor, leaving installation and service labor outside its coverage.
- 12,000 BTU capacity is less suited to large spaces than the 18,000-BTU Rellytech.
Best for: Homeowners who want app or Alexa control, four operating modes, and a 110-volt system for a modest room or zone.
Not ideal for: Buyers heating or cooling a large open area, or anyone seeking a system they can install without hiring a professional.
- Cooling capacity:12,000 BTU
- Voltage:110 volts
- Wattage:1,020 watts
- Noise level:28 dB
- Refrigerant:R-454B
- Line set length:16 feet
- Controls:Remote, Alexa, and app
- Modes:Air conditioning, heat pump, dehumidifier, and fan
- Warranty:5 years on parts and compressor
Our verdict“Choose this Senville for a smart-controlled, four-mode 110-volt system in a moderate space, provided you have a professional installer.”
Rellytech Mini Split AC Heating System – 18,000 BTU, 19 SEER2, 208‑230 V
For a larger zone, this Rellytech’s 18,000-BTU cooling capacity and 18,400-BTU heating capacity give it a clear sizing advantage over the 12,000-BTU Senville LETO and the 12,000-BTU COSTWAY. The listing specifies coverage up to 1,250 square feet, although actual room performance depends on insulation, layout, climate, and other site conditions. A 19 SEER2 rating and 8.5 HSPF2 provide useful efficiency figures for buyers comparing seasonal operation, while ECO mode offers another way to manage use. Four fan speeds and a 90-degree vertical swing let users adjust airflow rather than relying on one fixed pattern. The tradeoff is electrical and installation fit: it requires 208–230 volts and professional installation, so it may need electrical planning that the 115-volt COSTWAY does not.
Pros:- 18,000-BTU cooling and 18,400-BTU heating capacities suit larger zones than the 12,000-BTU models.
- Listed 19 SEER2 and 8.5 HSPF2 efficiency figures support comparison of seasonal performance.
- ECO function and four fan speeds provide operating and airflow adjustments.
- 90-degree vertical swing helps distribute air across a room.
Cons:- Requires a 208–230-volt supply, which may call for electrical work or rule it out in some homes.
- Professional installation is required.
- Higher capacity can be a poor fit for smaller rooms without careful sizing.
Best for: Homeowners outfitting a large room or open-plan zone who have 208–230-volt service and want higher capacity than a 12,000-BTU system.
Not ideal for: Buyers cooling a small bedroom, working with only 115-volt service, or seeking a clearly specified included installation kit.
- Cooling capacity:18,000 BTU
- Heating capacity:18,400 BTU
- Listed coverage:Up to 1,250 sq ft
- Voltage:208–230 V
- Efficiency:19 SEER2
- Heating efficiency:8.5 HSPF2
- Fan speeds:4: high, medium, low, and Auto
- Vertical swing:90°
- Operating modes:Cooling, heating, fan, and dry
Our verdict“Pick the Rellytech when your space needs more capacity than a 12,000-BTU system and your electrical setup supports 208–230 volts.”
COSTWAY 12,000 BTU Mini Split Air Conditioner and Heater, 20 SEER2, 115V
The COSTWAY stands out among these 12,000-BTU options for its 20 SEER2 rating, 115-volt supply, and broad set of controls. Wi-Fi, Alexa, Google Assistant, and a remote give households several ways to adjust temperature; eight fan speeds and 4D airflow add more flexibility than the Garvee’s listed four operating modes and remote control. Its stated coverage reaches 750 square feet, and it can heat in outdoor conditions down to -4°F, a lower listed threshold than the Senville LETO’s 5°F. That does not replace proper climate- and home-specific sizing, but it gives the COSTWAY a wider stated heating range. Washable filters and self-cleaning features may simplify routine upkeep. The tradeoff is that professional installation is recommended and the system requires a compatible outdoor unit, so buyers should confirm the full system and installation plan before choosing it.
Pros:- 20 SEER2 rating is higher than the 19 SEER2 listed for the Garvee and Rellytech options in this batch.
- Supports Wi-Fi app control, Alexa, Google Assistant, and remote operation.
- Eight fan speeds and 4D airflow offer detailed adjustment of air delivery.
- Washable filters and self-cleaning features can reduce routine maintenance effort.
Cons:- Professional installation is recommended.
- Requires a compatible outdoor unit, so buyers should verify the complete system configuration.
- 12,000-BTU capacity may not suit larger or poorly insulated spaces.
Best for: Homeowners seeking a 115-volt, 12,000-BTU system with app and voice controls, multiple airflow settings, and a low listed outdoor heating threshold.
Not ideal for: Buyers who need a complete DIY-ready setup, do not want to depend on a compatible outdoor unit, or need more than 12,000 BTU.
- Cooling capacity:12,000 BTU
- Heating capacity:12,000 BTU
- Listed coverage:Up to 750 sq ft
- Efficiency:20 SEER2
- Voltage:115 V
- Noise level:As low as 28 dB
- Controls:Wi-Fi app, Alexa, Google Assistant, and remote
- Modes:Auto, cool, heat, dry, fan, ECO, and sleep
- Operating temperature:Heating down to -4°F; cooling up to 127°F
Our verdict“Choose the COSTWAY for a feature-rich 115-volt system with strong listed efficiency and app controls, after confirming the outdoor-unit setup.”
Garvee 12,000 BTU Mini-Split Air Conditioner with Heat Pump, 115V, 19 SEER2, White
The Garvee’s main differentiator is its listed 23-dB noise level, lower than the 28 dB listed for the COSTWAY and 12,000-BTU Senville. That makes it worth a closer look for a bedroom or quiet living area, provided the product’s noise specification matches the buyer’s intended operating mode. Its 115-volt supply, 12,000-BTU cooling capacity, 12,500-BTU heating capacity, and stated coverage up to 750 square feet put it in the same general size category as the COSTWAY, but the COSTWAY offers more control options and a higher listed efficiency rating. Garvee supplies a remote and installation kit, yet professional installation is required. I would also treat the warranty as an open question: the listing mentions five years, while product details show one year, so buyers should confirm the applicable coverage before purchase.
Pros:- Listed noise level of 23 dB is lower than the 28-dB figures for the COSTWAY and 12,000-BTU Senville.
- Provides both heating and cooling with a 12,000-BTU cooling capacity.
- 115-volt electrical requirement may suit homes not set up for 208–230 V.
- Includes an installation kit and remote control.
Cons:- Warranty information conflicts: the listing mentions five years, while product details list one year.
- Professional installation is required.
- No app or voice control is specified, unlike the COSTWAY and Senville LETO.
Best for: Homeowners prioritizing a low listed indoor noise level for a bedroom or quiet room and whose space suits a 12,000-BTU system.
Not ideal for: Buyers who need clear warranty terms before ordering, want app or voice control, or require a larger-capacity system.
- Cooling capacity:12,000 BTU
- Heating capacity:12,500 BTU
- Listed coverage:Up to 750 sq ft
- Efficiency:19 SEER2
- Voltage:115 V
- Wattage:1,450 W
- Noise level:23 dB
- Modes:Cooling, heating, dry, and fan-only
- Warranty:Listing mentions 5 years; product details list 1 year
Our verdict“Consider the Garvee for a quiet, 115-volt room system, but verify its warranty terms and installation requirements first.”
Senville LETO Mini Split Air Conditioner & Heat Pump, 24000 BTU, White
This 24,000-BTU Senville LETO is the high-capacity choice in this batch, set apart from the 12,000-BTU Senville and COSTWAY by its larger stated output for bigger zones. Its cooling, heat pump, dehumidifier, and fan modes cover the same basic all-season jobs as the smaller LETO, and Alexa compatibility adds voice control. The included installation kit and 16-foot line set can help a contractor plan the setup, but professional installation is still required. At 34 dB, its listed noise level is higher than the 28-dB figure for the smaller LETO and COSTWAY, so I would not choose it solely for a noise-sensitive bedroom. Heating is listed down to 5°F, and the five-year parts and compressor warranty provides defined component coverage, though labor is excluded. Its 220-volt requirement also needs to match the home’s electrical service.
Pros:- 24,000-BTU capacity offers a substantial step up from the 12,000-BTU Senville LETO and COSTWAY.
- Includes cooling, heating, dehumidifying, and fan functions.
- Alexa compatibility supports voice control.
- Includes a 16-foot line set and has a five-year parts and compressor warranty.
Cons:- Requires professional installation and 220-volt service.
- The 34-dB listed noise level is higher than the smaller Senville LETO and COSTWAY figures.
- Warranty covers parts and compressor but excludes labor.
Best for: Homeowners with a larger room or zone who need more capacity than a 12,000-BTU unit and want Alexa-compatible controls.
Not ideal for: Buyers cooling a small room, those limited to 115-volt service, or anyone prioritizing the lowest listed noise level.
- Capacity:24,000 BTU
- Voltage:220 V
- Wattage:2,500 W
- Noise level:34 dB
- Refrigerant:R-454B
- Compressor type:Rotary scroll
- Controls:Alexa compatible
- Heating operation:Down to 5°F
- Warranty:5 years on parts and compressor
Our verdict“Choose this Senville LETO when a larger space calls for 24,000 BTU and your home supports 220 volts, not when quiet operation or small-room sizing is the priority.”
How We Picked
I compared the 15 listings using buyer-facing details that are stated in the product names: BTU capacity, SEER2 rating, voltage, heating capability, and named extras such as Wi-Fi or an installation kit. I gave more weight to a clearly stated combination of capacity and efficiency than to broad feature claims, while treating room coverage and installation compatibility as questions buyers must verify against the full manufacturer documentation. The supplied details do not establish independent performance results, warranty terms, operating noise, or certification status, so I do not present those as confirmed strengths.
The ranking reflects how easy each option is to match to a distinct need, not a claim that every system will perform equally in every home. Temprium ranks first for its listed 22 SEER2 rating, 12,000 BTU capacity, and Wi-Fi; the 9,000 BTU Senville LETO and Rellytech models stand out for smaller spaces, while the 18,000 and 24,000 BTU systems serve larger-load needs. The 12,000 BTU models with stated 18–20 SEER2 ratings offer more direct comparisons, but buyers should verify electrical requirements, included components, and actual system performance before choosing.
Factors to Consider When Choosing Best Mini Split Air Conditioners
Choosing a mini split starts with the room and the installation—not the longest feature list. I would use these checks to rule out mismatches before comparing efficiency claims or convenience features.
Match Capacity to the Space and Its Heat Load
BTU capacity is a starting point, not a room-size guarantee. Ceiling height, insulation, window area, sun exposure, climate, and adjoining rooms can all change the heating and cooling load. A unit that is too small may run constantly and struggle during extreme weather, while an oversized system can cycle poorly and leave humidity less controlled. Do not rely on a broad square-foot claim without checking how the manufacturer calculated it. For an open-plan room or a space with unusual heat gain, ask an HVAC professional for a load calculation before selecting between 9,000, 12,000, 18,000, and 24,000 BTU options.
Check Voltage and Electrical Work Before Ordering
Voltage can decide whether a system is practical for your home before its other features matter. The listed products include 115V options and an 18,000 BTU Rellytech model specified for 208–230V; those requirements are not interchangeable. Confirm the exact electrical specifications for the indoor and outdoor units, circuit size, disconnect, and wiring with the installation manual and a qualified electrician. A 115V label does not by itself mean a system can use any existing outlet. Checking the panel and installation route first can prevent a return, extra electrical work, or a delayed project.
Compare Efficiency Ratings Carefully
SEER2 helps compare cooling efficiency, but it does not predict your exact utility bill. Usage patterns, local weather, thermostat settings, installation quality, and equipment sizing all affect energy consumption. This roundup includes stated ratings from 17 to 22 SEER2, including several 12,000 BTU models, so the label can help distinguish options with otherwise similar capacity. Check that the rating applies to the complete system configuration you are buying, not a different size or variant. If heating is a major use, also look for heating efficiency and low-temperature performance data rather than choosing on SEER2 alone.
Budget for the Full Installation, Not Just the Equipment
A ductless system commonly needs a suitable wall location, a line-set path, condensate drainage, outdoor-unit support, and electrical work. An advertised installation kit may supply selected materials, but it does not confirm that the system is ready for a do-it-yourself installation or that every required part is included. Refrigerant-line work and local rules can require qualified, licensed professionals. Request an installation quote before committing, and ask whether the quote includes mounting, line-set length, electrical changes, permits, commissioning, and disposal of old equipment. The cheapest equipment choice may not be the least expensive completed installation.
Treat Convenience Features as Tie-Breakers
Wi-Fi control can help if you want to adjust schedules remotely, but it should not outweigh the basics of capacity, electrical compatibility, and service support. Check whether the app, account setup, and home network requirements suit the people who will use the system. Timers and remote controls may be enough for buyers who prefer simple operation or do not want another connected device. Also confirm that advertised modes and controls apply to the exact model variant, since listings can group several configurations together. I would pay extra attention to usability only after verifying the system’s fit and installation plan.
Verify Warranty, Certification, and Service Access
Product names alone do not answer what happens if a component fails. Before buying, find the written warranty, registration rules, parts availability, and the process for getting technical support. Check the exact model number against applicable safety and efficiency certification records, since model families can include multiple configurations. Ask the installer whether they will service equipment purchased separately and whether installation affects warranty coverage. These checks are especially useful when two models have similar capacity and efficiency claims: reliable documentation and accessible service can matter more over time than a small difference in a listed feature.
Frequently Asked Questions
Is a 12,000 BTU mini split the right choice for my room?
It may be, but square footage alone is not enough to decide. Insulation, ceiling height, climate, sun exposure, windows, and the room’s connection to other spaces can change the required capacity. Use the manufacturer’s sizing guidance as an initial screen, then get a heating and cooling load calculation when the room is unusually exposed or connected to an open-plan area. The 12,000 BTU models in this roundup differ in listed efficiency and features, but none can be declared the right size for your home from capacity alone. Correct sizing helps avoid poor comfort and inefficient operation.
Can I install a 115V mini split using a standard household outlet?
Do not assume that a 115V specification means a standard outlet is suitable. Mini splits can have specific circuit, breaker, wiring, and disconnect requirements, and the installation manual for the exact model is the authority. Have an electrician confirm the home’s existing circuit and the equipment’s electrical requirements before ordering. Also check whether the outdoor unit needs a dedicated circuit or other work. This matters when comparing the 115V options with a model such as the 18,000 BTU Rellytech listing, which specifies 208–230V service.
Should I choose the highest SEER2 rating in this roundup?
Not automatically. The Temprium listing has the highest stated rating here at 22 SEER2, but the savings depend on how often you run the system, local energy costs, climate, and whether the unit is correctly sized and installed. Check that the rating belongs to the exact model configuration, and compare heating performance too if you expect to rely on the heat pump. A higher rating may be a sensible priority for long cooling seasons or frequent use, while electrical compatibility, service support, and installation cost can matter more in other homes. Treat the rating as one part of the decision, not a guarantee of lower bills.
Are these mini splits suitable as a home’s only heating system?
That depends on the model’s heating capacity at your local winter temperatures and whether the home’s heat load falls within its operating range. A listing that says “heat pump” confirms a heating function but does not, by itself, show how much heat the unit supplies in cold weather. Find the manufacturer’s low-temperature performance data and ask an HVAC professional whether backup heat is needed. The 9,000, 12,000, 18,000, and 24,000 BTU versions also serve different loads, so capacity must match the space. Check local climate, utility rates, and service availability before replacing existing heat.
What should I verify before buying a mini split online?
Confirm the exact indoor and outdoor unit model numbers, voltage, included line-set and mounting parts, and whether the listed capacity and efficiency match that specific combination. Read the warranty conditions and check whether professional installation or registration is required. Get a written installation estimate that accounts for electrical work, permits, line-set routing, condensate drainage, and commissioning. Ask a local installer whether they will work on the selected equipment and provide future service. These checks can reveal extra requirements that a product title or package list will not show.
Conclusion
For most buyers comparing these listings, I would start with the Temprium 12,000 BTU, 22 SEER2 model as the best overall choice on stated efficiency and included Wi-Fi, subject to confirming its full specifications and fit. The best value is a well-matched 12,000 BTU option such as the Albott 18 SEER2 or COSTWAY 20 SEER2 listing, chosen after checking electrical needs and installation costs rather than feature count alone. For smaller rooms, compare the Senville LETO 9,000 BTU with the Rellytech 9,000 BTU, using voltage, efficiency, documentation, and service access to break the tie. Buyers seeking a larger-capacity or premium-sized option can consider the Rellytech 18,000 BTU or Senville LETO 24,000 BTU, but should verify load calculations and electrical compatibility first. For beginners, the best path is the model a qualified installer can size, install, and support—not simply the one with the most features.
Halloween Picks
halloween
As an affiliate, we earn on qualifying purchases.
