When adding a new room or extending your home’s HVAC system, choosing the right mini split is essential. The Rellytech 11500 BTU Mini Split stands out as the overall best for its balance of performance and affordability, while the YITAHOME 12000 BTU Mini Split offers exceptional efficiency with its high SEER rating. Other options, like the Daikin 18,000 BTU, cater to larger spaces but come at a higher price point. The main tradeoffs involve balancing installation complexity, upfront costs, and operating efficiency. Continue reading for a detailed breakdown of the top models and what makes each a good fit for specific needs.
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Key Takeaways
- The highest SEER ratings correlate with better long-term energy savings, making models like YITAHOME standout for efficiency.
- Larger BTU capacities, such as the Daikin 18,000 BTU, are better suited for bigger additions but typically come with higher costs and installation considerations.
- Inverter technology is common among top models, providing quieter operation and more precise temperature control.
- Ease of installation varies; ductless systems like these are generally simpler, but some models have more flexible mounting options.
- Price differences reflect features like capacity, efficiency, and included accessories, so buyers should prioritize based on their space size and budget.
| mini split systems for additions and extension | Refrigerant | Cooling Power |
|---|---|---|
| Rellytech 11500 BTU Mini Split | R32 | 11500 BTU |
| Albott 12,000 BTU Mini Split A | R32 | 12000 BTU |
| 12000 BTU Mini Split AC/Heatin | R32 | — |
| Senville LETO Mini Split Air C | Pre-loaded | — |
| YITAHOME 12000 BTU Mini Split | R32 | — |
| Daikin 12,000 BTU 18 SEER2 Ent | — | 12,000 BTU |
| Daikin 18,000 BTU 18 SEER2 Ent | — | 18,100 BTU |
More Details on Our Top Picks
Rellytech 11500 BTU Mini Split AC/Heating System 17 SEER2 Ductless Inverter
This mini split stands out for its combination of energy efficiency and quiet operation, making it ideal for bedrooms or home offices. Its inverter technology reduces power consumption compared to non-inverter models, and at just 29dB, it operates silently, similar to the Albott 12,000 BTU but with a more compact footprint. The self-cleaning feature helps maintain air quality, a step up from basic models. However, installation requires professional service due to hardwiring and vacuum-pumping, and it’s limited to spaces up to 550 sq.ft., which might restrict larger extensions. Still, for smaller rooms where comfort and low noise matter, this option delivers reliable performance without excessive energy use.
Pros:- Energy-efficient inverter operation reduces power consumption
- Quiet operation at 29dB ideal for bedrooms and offices
- Self-cleaning feature helps maintain air quality
- Flexible airflow with adjustable louvers and iFEEL technology
Cons:- Requires professional installation due to hardwiring and vacuum-pumping
- Power cord not included, additional purchase needed
Best for: Homeowners seeking a quiet, energy-efficient system for a small addition or bedroom.
Not ideal for: Larger spaces over 550 sq.ft. or those preferring DIY installation.
- Cooling Power:11500 BTU
- SEER:17
- Noise Level:29 dB
- Filter Type:Mesh Filter
- Inverter Type:Has Inverter
- Refrigerant:R32
Our verdict“This model is perfect for small, quiet spaces where efficient, low-noise climate control is a priority.”
Albott 12,000 BTU Mini Split Air Conditioner and Heater SEER2 18, 115V
Compared to the Rellytech, the Albott 12,000 BTU offers a broader 750 sq.ft. coverage with an impressive SEER2 18 rating, translating into lower energy bills over time. Its quiet operation below 29dB matches the Rellytech, but it enhances comfort with additional modes like dehumidifying and sleep, making it more versatile for year-round use. The self-cleaning feature simplifies maintenance, although installation still requires a professional. While the Albott provides more space and slightly higher efficiency, it comes at a similar upfront cost and shares the same installation complexity. For those needing a larger capacity system that balances efficiency and ease of use, this model makes a compelling choice.
Pros:- Higher SEER2 18 rating for maximum energy savings
- Quiet operation below 29dB suitable for living areas
- Includes dehumidify and sleep modes for comfort
- Self-cleaning function for easier maintenance
Cons:- Requires professional installation
- Limited to spaces up to 750 sq.ft.
Best for: Families or small businesses extending cooling to spaces up to 750 sq.ft. with energy savings in mind.
Not ideal for: Small bedrooms or spaces under 550 sq.ft. where a smaller unit would be more appropriate.
- Cooling Power:12000 BTU
- SEER:18
- Noise:29 db
- Filter Type:Mesh Filter
- Refrigerant:R32
- Application:Residential
Our verdict“This system suits larger living or working spaces where energy efficiency and versatile features are priorities.”
12000 BTU Mini Split AC/Heating System, 17 SEER2, 115V
This unit is distinguished by its smart control options, including app and voice compatibility with Alexa, making it ideal for tech-savvy users. Its 17 SEER2 rating and R32 refrigerant promote eco-friendly operation and energy savings comparable to the Albott but with added convenience. The included accessories and complete installation kit simplify setup, yet professional installation remains necessary. Compared with the YITAHOME, this model offers more advanced smart features but slightly lower SEER2 efficiency. It’s best suited for users who prioritize connectivity and eco-conscious operation in spaces up to 750 sq.ft., though upfront costs may be higher due to smart technology.
Pros:- Smart app and voice control compatibility
- Eco-friendly R32 refrigerant and 17 SEER2 efficiency
- Includes complete installation kit and accessories
- All-season heating and cooling modes
Cons:- Requires professional installation
- Potential higher upfront cost due to smart features
Best for: Homeowners wanting a smart, eco-friendly system with app and voice control for medium-sized spaces.
Not ideal for: Those preferring manual controls or planning a DIY install, as setup is complex.
- Cooling Capacity:12000 BTU
- SEER2:17
- Refrigerant:R32
- Included Accessories:Indoor/outdoor units, remote, line set
- Application:Home
Our verdict“This system is ideal for tech-oriented users seeking eco-friendly, smart climate control for medium-sized areas.”
Senville LETO Mini Split Air Conditioner, Heat Pump, 12000 BTU
The Senville LETO stands out for its all-in-one capability, combining cooling, heating, dehumidifying, and fan functions in a single package. Its compatibility with Alexa and app control makes it user-friendly for those who value voice-command convenience, similar to the YITAHOME but with a broader feature set. The pre-loaded refrigerant line set simplifies installation, although professional setup remains advisable. Compared to the other systems, the LETO’s versatility makes it more suitable for varied climate conditions and multi-season operation, though labor costs and installation complexity are similar. This makes it a strong choice for users wanting a comprehensive, ready-to-go solution for spaces up to 25 ft. refrigerant run length.
Pros:- Alexa-compatible voice control and app integration
- Versatile 4-in-1 system: cooling, heating, dehumidifier, fan
- Includes comprehensive installation kit and warranty
- Functional down to 5F/-15C for cold climates
Cons:- Professional installation required
- Labor costs not included
Best for: Homeowners or small businesses seeking a versatile, all-season climate control system with voice control.
Not ideal for: DIY enthusiasts or those with tight budgets, as installation costs are not included.
- BTU:12000
- Refrigerant:Pre-loaded
- Certifications:UL Listed, AHRI Certified
- Temperature Range:5F to 115F
Our verdict“This all-in-one mini split is perfect for users who want flexible climate control with smart features in a single package.”
YITAHOME 12000 BTU Mini Split AC/Heating System 115V 20 SEER2
The YITAHOME system clearly targets efficiency with its 20 SEER2 rating, surpassing all other options in this roundup, including the Albott and Rellytech. Its whisper-quiet operation below 41dB makes it suitable for sensitive spaces like bedrooms and nurseries. The inclusion of smart controls and an operating temperature range from 5F to 118F ensures year-round reliability, similar to the Albott but with better energy savings. However, like all high-performance systems, it requires professional installation, and the refrigerant is pre-charged, limiting user maintenance. While its higher upfront cost reflects its premium efficiency and quietness, this model is best for those who prioritize ongoing energy savings and minimal noise over initial investment.
Pros:- Exceptional 20 SEER2 energy efficiency for cost savings
- Very quiet operation below 41dB
- Smart WiFi control with multiple modes
- All-weather performance for year-round comfort
Cons:- Requires professional installation
- Includes only indoor and outdoor units, other parts sold separately
Best for: Users seeking the most energy-efficient, quiet, and reliable extension system for medium to large spaces.
Not ideal for: Budget-conscious buyers or those comfortable with simpler, less expensive units that lack smart features.
- Cooling Capacity:12000 BTU
- SEER:20
- Refrigerant:R32
- Noise Level:Below 41 decibels
- Operating Temperature:5°F to 118°F
Our verdict“This premium system is ideal for those prioritizing energy efficiency and quiet operation in larger or extension spaces.”
Daikin 12,000 BTU 18 SEER2 Entra R32 Series Heat Pump Mini Split A/C
This Daikin model excels in providing high energy efficiency with an 18 SEER2 rating, making it a strong choice for those prioritizing lower operating costs. It performs well across a wide temperature range, ensuring reliable heating and cooling even in variable climates. Compared to the 18,000 BTU version, this unit is better suited for smaller areas up to 550 sq. ft., offering precise climate control without excess capacity. However, its higher upfront cost and need for professional installation can be deterrents for budget-conscious or DIY-focused buyers. Its advanced air purification and customizable airflow add comfort and air quality benefits, but these features are less impactful for larger or more open spaces. This pick makes the most sense for homeowners looking for an efficient, space-limited solution that doesn’t require extensive capacity.
Pros:- Very high energy efficiency with 18 SEER2 rating
- Effective across a broad temperature range, from 5°F to 115°F
- Includes advanced air purification for improved indoor air quality
- Compact design suitable for small spaces
Cons:- Requires professional installation, adding to upfront costs
- Limited to spaces up to 550 sq. ft., not suitable for larger areas
Best for: Homeowners with small additions or extensions up to 550 sq. ft. seeking energy-efficient operation
Not ideal for: Property owners with larger spaces over 550 sq. ft. or those on a tight budget, due to limited capacity and higher initial cost
- Cooling Power:12,000 BTU
- Heating Capacity:11,300 BTU
- SEER2:18
- HSPF2:9
- EER2:8.5
- Coverage Area:up to 550 sq. ft.
Our verdict“This unit is ideal for small, energy-conscious spaces where efficiency and air quality are priorities.”
Daikin 18,000 BTU 18 SEER2 Entra R32 Series Heat Pump Mini Split A/C
This Daikin model offers a substantial 18,000 BTUs of capacity, making it better suited for larger additions up to 1,000 sq. ft., unlike the smaller 12,000 BTU unit. It maintains an impressive 18 SEER2 efficiency rating, ensuring low operating costs across a broad temperature range from 5°F to 115°F. Compared with the smaller model, it provides more capacity without sacrificing energy savings, making it an excellent choice for sunrooms, garages, or extended areas. The inclusion of advanced air purification and customizable airflow enhances comfort, but the larger size and higher price point could be less appealing for small or budget-sensitive projects. Its effective capacity and efficiency make it a flexible option for those needing reliable climate control over a bigger space. This unit makes the most sense for homeowners extending their living or working areas and seeking a versatile, efficient solution.
Pros:- High capacity suitable for larger spaces up to 1,000 sq. ft.
- Maintains high efficiency with 18 SEER2 rating
- Operates effectively across a wide temperature range
- Includes advanced air purification and airflow customization
Cons:- Requires professional installation, adding cost and complexity
- Higher upfront investment compared to smaller models
- Potentially more oversized for very small spaces
Best for: Homeowners or renovators with spaces up to 1,000 sq. ft. needing effective heating and cooling with energy efficiency
Not ideal for: Buyers with smaller additions under 550 sq. ft. or those with tight budgets, as capacity and cost may be excessive
- Cooling Power:18,100 BTU
- Heating Capacity:18,000 BTU
- SEER2:18
- HSPF2:9
- EER2:10.5
- Coverage Area:up to 1,000 sq. ft.
Our verdict“This model is best for larger additions where capacity and efficiency are both priorities, and a professional install is feasible.”
How We Picked
I evaluated these mini split systems based on several key criteria: cooling and heating capacity relative to typical addition sizes, energy efficiency measured by SEER ratings, ease of installation, build quality, and overall value. Systems with inverter technology received higher marks because they offer quieter operation and lower running costs. I also considered user-reported reliability and manufacturer reputation to ensure durability. The ranking reflects a balanced view of performance, cost, and suitability for various extension sizes and budgets, helping buyers find a model that aligns with their specific needs.| mini split systems for additions and extension | Refrigerant |
|---|---|
| Rellytech 11500 BTU Mini Split | R32 |
| Albott 12,000 BTU Mini Split A | R32 |
| 12000 BTU Mini Split AC/Heatin | R32 |
| Senville LETO Mini Split Air C | Pre-loaded |
| YITAHOME 12000 BTU Mini Split | R32 |
| Daikin 12,000 BTU 18 SEER2 Ent | — |
| Daikin 18,000 BTU 18 SEER2 Ent | — |
Factors to Consider When Choosing Best Mini Split Systems For Additions And Extensions
Choosing the best mini split for an addition involves more than just capacity and price. It’s important to consider how the system integrates with your existing setup, the climate in your area, and your long-term comfort goals. Proper sizing prevents energy waste and ensures efficient heating or cooling. Installation complexity can vary, especially if wall-mounting or outdoor unit placement is involved. Additionally, ongoing maintenance and warranty coverage are factors that influence long-term satisfaction. This guide covers key considerations that go beyond product specs to help you make a well-informed decision.Capacity and Sizing
Correctly sizing your mini split is crucial to avoid over- or under-performance. An oversized system may cycle on and off frequently, reducing efficiency and increasing wear, while an undersized unit struggles to maintain comfort. For additions, consider the square footage, insulation quality, and climate, then choose a model with appropriate BTU capacity. It’s often wise to consult with an HVAC professional for precise sizing, especially if the space has unique features like high ceilings or large windows.
Energy Efficiency and Operating Costs
High SEER ratings generally mean lower energy bills over time, especially if the addition is used regularly. Models like the YITAHOME with a 20 SEER2 rating provide significant savings but may come at a higher initial cost. Consider your climate; in warmer regions, investing in more efficient units can pay off faster. Look for inverter technology, which allows the compressor to modulate its output, reducing energy waste and noise while maintaining consistent comfort.
Ease of Installation
Most mini splits are designed for straightforward installation, but factors like outdoor unit placement, wall accessibility, and electrical requirements can influence complexity and cost. Some models include features like pre-charged lines or flexible mounting options, simplifying the process. If you’re hiring a professional, verify that your chosen system aligns with local codes and that the installer is experienced with mini splits for additions. Avoid overly complex configurations that could lead to higher labor costs or future maintenance challenges.
Build Quality and Reliability
Durability matters, especially for systems installed in outdoor environments. Reputable brands like Daikin tend to offer better warranty coverage and proven longevity, which can justify higher prices. Look for units with corrosion-resistant components, quality compressors, and positive user reviews. Remember that a cheaper model may save money upfront but could incur higher maintenance costs or failures over time, so balancing quality and budget is key.
Budget and Long-Term Value
While initial costs are important, consider the total cost of ownership, including energy bills, maintenance, and potential repairs. Sometimes investing more upfront in a higher-efficiency system results in lower operating costs, making it a smarter long-term buy. Conversely, if your addition is small or used infrequently, a more affordable model might suffice. Understanding your specific usage pattern helps avoid overspending on features you won’t need.
Frequently Asked Questions
How do I know what size mini split I need for my addition?
Accurately sizing your mini split depends on the addition’s square footage, insulation quality, and local climate. A general rule is about 20 BTU per square foot, but this can vary. For larger or poorly insulated spaces, a higher capacity unit might be necessary. Consulting with an HVAC professional can help determine the precise size, ensuring you avoid wasted energy or insufficient heating and cooling.
Are inverter mini splits worth the extra cost?
Inverter technology provides significant benefits in efficiency, noise reduction, and comfort. Although they typically cost more upfront, inverter mini splits adjust their compressor speed based on demand, which lowers energy bills and minimizes cycling. For additions that will be used frequently, this efficiency can lead to substantial savings over time, making the extra investment worthwhile.
Can I install a mini split myself, or should I hire a pro?
While some handy homeowners may attempt DIY installation, mini split systems generally require specialized tools and knowledge, especially for refrigerant handling and electrical connections. Incorrect installation can lead to poor performance, higher energy costs, or damage to the unit. Hiring a qualified HVAC technician ensures proper setup, adherence to safety standards, and warranty protection, making it the safer choice for most homeowners.
What should I consider when installing a mini split outdoors?
Outdoor unit placement is critical for optimal performance and longevity. It should be installed on a stable, level surface with adequate clearance for airflow and maintenance. Avoid locations with excessive exposure to direct sun, wind, or debris. Proper drainage and protection from harsh weather can extend the system’s lifespan. A professional installer can assess your site and recommend the best mounting options for durability and efficiency.
How often does a mini split system need maintenance?
Mini split systems typically require minimal maintenance, with regular filter cleaning every few months to maintain airflow and efficiency. Checking the outdoor unit for debris and ensuring proper refrigerant levels annually helps keep the system in good shape. Most manufacturers recommend professional inspections at least once a year to identify potential issues early. Proper maintenance can extend the lifespan and ensure consistent performance over many years.
Conclusion
For most homeowners looking to add a single room or extend their living space, the Rellytech 11500 BTU Mini Split offers a reliable balance of capacity, efficiency, and affordability—making it the best overall choice. If your priority is long-term savings and energy efficiency, the YITAHOME 12000 BTU with its high SEER rating is ideal. For larger additions or more demanding conditions, the Daikin 18,000 BTU provides ample capacity and durability, though at a higher price. Beginners or those with smaller budgets may prefer simpler models, while those with larger spaces or specific climate needs should consider premium options. Ultimately, matching the system to your space size, usage patterns, and budget will yield the best results.
