When choosing the best mini split air conditioner for efficient backup cooling, you need a system that balances power, energy efficiency, and ease of installation. The DELLA Vario Series stands out for its smart features and high SEER2 rating, making it a versatile top choice. For larger spaces, the Garvee 11500 BTU Mini Split offers impressive coverage and WiFi control, ideal for whole-room cooling. The main tradeoffs in this category often involve balancing upfront costs against long-term energy savings and compatibility with existing systems. Continue reading for a detailed breakdown of the top options and what makes each suitable for different needs.
Key Takeaways
- High SEER2 ratings consistently correlate with better energy efficiency and lower operating costs.
- WiFi and smart home compatibility add convenience but are often found on higher-end models.
- Larger BTU capacities provide effective backup cooling for bigger spaces, but may come with higher initial costs.
- Installation complexity varies; models with included kits tend to be easier for DIY setup.
- Pricing often reflects build quality, feature set, and brand reputation—paying more typically yields better long-term value.
More Details on Our Top Picks
DELLA Vario Series 12000 BTU Mini Split Air Conditioner with Alexa Compatibility, Heat Pump, 23 SEER2, Cools Up to 550 Sq. Ft, Includes 16.4 ft Installation Kit
This model stands out for its high 23 SEER2 rating, making it one of the most energy-efficient options for backup cooling that also provides reliable heating. Compared with the 12000BTU Mini Split AC & Heater, it offers a superior SEER rating, which translates into lower energy bills during backup operation. Its smart features, including Alexa compatibility and app control, add convenience, especially for tech-savvy users. However, the requirement for professional installation and refrigerant line adjustments could be a hurdle for DIY enthusiasts. The quiet operation at only 28 dBa makes it suitable for bedrooms or living rooms, ensuring minimal disruption during backup cooling. Overall, this pick makes the most sense for homeowners who want a highly efficient, smart, all-in-one system for year-round comfort.
Pros:- Exceptional 23 SEER2 efficiency reduces energy costs
- Smart features including Alexa compatibility and app control
- Quiet operation at just 28 dBa, suitable for bedrooms
Cons:- Requires professional installation, increasing upfront costs
- Line-set adjustments need refrigerant recharging, complicating setup
Best for: Homeowners seeking a highly energy-efficient, smart backup cooling system that also offers heating.
Not ideal for: DIYers or renters who prefer easy, DIY installation without professional help.
- Cooling Power:12000 BTU
- SEER:23 SEER2
- Heating Capacity:Pre-charged heat pump (up to -4℉/-20℃)
- Voltage:208-230V
- Noise Level:28 dBa
- Coverage Area:Up to 550 sq. ft
Bottom line: Ideal for homeowners who prioritize energy efficiency and smart features in a backup cooling system.
Garvee 11500 BTU Mini Split AC/Heating System, WiFi Enabled, Energy Efficient, Wall-Mounted, Cools Up to 750 Sq.Ft
The Garvee 11500 BTU mini split offers a strong balance between capacity and smart control, making it well-suited for larger rooms up to 750 sq. ft. Its WiFi connectivity allows for remote control, much like the DELLA Vario, but it’s slightly less efficient with a 17 SEER rating. Compared to the 12000BTU Wall-Mounted system, it provides a lower capacity but is slightly more affordable and easier to install. Its quiet operation at 28 decibels and use of eco-friendly R32 refrigerant make it appealing for those prioritizing low noise and green credentials. The main tradeoff is its reduced cooling capacity relative to larger spaces or hotter climates, which might limit its backup cooling effectiveness in extreme conditions.
Pros:- WiFi-enabled for remote operation
- Quiet at 28 decibels, suitable for living spaces
- Eco-friendly R32 refrigerant
Cons:- Lower SEER (17) compared to premium options
- Limited to 750 sq. ft, not ideal for bigger or hotter spaces
Best for: Homeowners needing reliable backup cooling for large living rooms or open spaces with WiFi control.
Not ideal for: Users in very hot climates or with larger, multi-room needs where higher capacity is essential.
- Cooling Power:11500 BTU
- SEER:17
- WiFi Enabled:Yes
- Noise Level:28 dB
- Coverage Area:750 sq. ft
- Refrigerant:R32
Bottom line: Best suited for tech-friendly homeowners with large rooms up to 750 sq. ft. who prioritize remote control and eco-friendliness.
12000BTU Mini Split Air Conditioner & Heater, 17 SEER2, Wall-Mounted, Cools Rooms up to 750 Sq. Ft, Energy Efficient Inverter with Heat Pump
This unit combines a solid 17 SEER2 efficiency with inverter technology, making it an excellent choice for those wanting to reduce energy costs during backup cooling. Its capacity to cool and heat up to 750 sq. ft aligns well with larger spaces, comparable to the Garvee but with slightly higher efficiency. The system’s auto-defrost and self-cleaning features help minimize maintenance, while the quiet operation—down to 26 dB—adds to its appeal. However, professional installation is recommended, and the wattage at 1100 watts could pose concerns for energy-conscious buyers. It’s a balanced option for those who need energy-efficient backup cooling with reliable heating capabilities.
Pros:- Inverter technology for up to 35% energy savings
- Quiet operation at as low as 26 dB
- Includes self-cleaning and auto-defrost features
Cons:- Installation recommended, adding to cost
- Requires professional setup, not DIY-friendly
Best for: Homeowners who want a dependable, energy-efficient backup system for large rooms with minimal ongoing maintenance.
Not ideal for: Renters or those uncomfortable with professional installation or higher upfront costs.
- BTU:12000
- SEER2:17
- Noise Level:as low as 26 dB
- Coverage:up to 750 sq. ft
- Refrigerant:R-32
- Voltage:115V
Bottom line: Ideal for users seeking an energy-efficient, low-maintenance backup cooling solution for large spaces.
Mini Split AC/Heating System – 12000 BTU Ductless Mini Split Air Conditioner with Heat Pump, 19 SEER2, 115V, Up to 750 Sq.Ft
This system offers a 19 SEER2 rating, making it one of the most efficient choices among systems rated for backup cooling in larger spaces. Its capacity of 12,000 BTU supports cooling and heating for rooms up to 750 sq. ft, comparable to the Garvee but with a higher efficiency rating. The inverter technology ensures lower energy use, and features like smart remote control, multiple modes, and eco-friendly R-32 refrigerant add convenience and sustainability. The unit’s wattage of 1100 watts is standard for its class, but the need for professional installation and the potential cost might be a concern for budget-conscious buyers. Overall, this model balances high efficiency and capacity, ideal for those prioritizing energy savings and year-round comfort.
Pros:- High 19 SEER2 efficiency reduces energy bills
- Suitable for large rooms up to 750 sq. ft.
- Smart remote with multiple modes and eco-friendly refrigerant
Cons:- Requires professional installation
- Higher upfront costs compared to simpler units
Best for: Large room owners who want maximum energy efficiency combined with smart control and eco operation.
Not ideal for: Buyers seeking a plug-and-play solution or with budget constraints due to installation costs.
- Cooling Power:12000 BTU
- SEER2:19
- Voltage:115V
- Coverage:up to 750 sq. ft
- Refrigerant:R-32
- Wattage:1100 watts
Bottom line: Best for consumers who want a high-efficiency, large-room backup cooling system that combines smart features and eco-friendliness.
MEPTY 9000BTU Mini Split AC/Heating System, 19 SEER2 Energy Efficient Ductless Inverter with Heat Pump, 110V, Cools Up to 450 sq.ft
This MEPTY system stands out for its impressive 19 SEER2 rating, making it one of the most energy-efficient options in this roundup. Compared to the DELLA Motto Series, it offers slightly less coverage but excels in quiet operation and quick response times, making it ideal for bedrooms and living spaces where noise matters. Its inverter technology ensures consistent comfort while significantly reducing energy bills, but the need for professional installation and its limited 450 sq.ft capacity mean it’s best suited for smaller, well-insulated rooms. Its 110V compatibility can be a hurdle for some, but overall, it provides reliable backup cooling with year-round heating capabilities.
Pros:- High energy efficiency with 19 SEER2 rating and inverter technology
- Versatile 4-in-1 modes including heating and dehumidifying
- Quiet operation at only 35 dB
Cons:- Requires professional installation due to split system setup
- Limited to 450 sq.ft, not suitable for large spaces
Best for: Homeowners with small to medium rooms seeking energy-efficient, quiet backup cooling and heating.
Not ideal for: Larger open-plan areas or spaces requiring 220V power and higher capacity, due to its size and voltage limitations.
- Cooling Power:9000 BTU
- SEER2:19
- Refrigerant:R32
- Noise Level:35 dB
- Power Voltage:110V
- Application:Residential
- Compressor Type:Rotary Scroll
- Outdoor Unit Required:Yes
Bottom line: This unit is ideal for those prioritizing energy savings and quiet operation in small rooms for backup cooling and heating.
DELLA Motto Series Mini Split AC, 17.5 SEER2, 12,000 BTU, 208-230V, Heat Pump, WiFi & Alexa Compatible
The DELLAMotto Series offers a compelling balance of efficiency and smart features, with a 17.5 SEER2 rating and coverage up to 550 sq.ft. compared to the MEPTY, it provides slightly less energy savings but adds the convenience of WiFi and Alexa compatibility, making remote management straightforward. Its quiet operation at 41 dBa and included installation kit simplify setup, yet it requires professional installation and has a higher upfront cost. The inverter technology ensures consistent comfort, but the need for line-set vacuuming and refrigerant line considerations could be a challenge for DIYers. This makes it ideal for tech-savvy users who want remote control and energy efficiency in medium-sized spaces.
Pros:- Smart home compatibility with WiFi and Alexa
- Quiet operation at 41 dBa
- Includes complete installation kit
Cons:- Requires professional installation
- Line-set vacuuming needed during setup
Best for: Tech-savvy homeowners seeking smart control features and reliable backup cooling for medium-sized rooms.
Not ideal for: Large open spaces or those on a tight budget, as higher upfront costs and installation complexity may be drawbacks.
- Cooling Capacity:12,000 BTU
- SEER2:17.5
- Voltage:208-230V
- Coverage Area:550 sq. ft
- Refrigerant:R32
- Smart Home Compatibility:Alexa, WiFi
Bottom line: This pick suits those who value smart features and moderate energy efficiency for medium-sized spaces.
Daikin 12,000 BTU 18 SEER2 Entra R32 Ductless Mini Split Heat Pump System with Installation Kit
The Daikin Entra system offers a sleek, high-efficiency option with an 18 SEER2 rating, making it ideal for those seeking energy savings in spaces up to 550 sq.ft. compared to the DELLA and MEPTY units. Its inverter technology provides precise temperature control and quiet operation, perfect for renovation projects or sunrooms. While its premium design and included installation kit simplify setup, the need for professional installation and higher initial investment could deter budget-conscious buyers. It’s especially suited for those who want a reliable, efficient backup cooling solution that blends seamlessly with home décor.
Pros:- High energy efficiency with 18 SEER2 rating
- Sleek, wall-mounted design complements décor
- Includes all necessary installation components
Cons:- Requires professional installation
- Limited to single-zone applications
Best for: Homeowners upgrading or renovating spaces needing energy-efficient cooling with a sleek aesthetic.
Not ideal for: Budget-sensitive buyers or those needing a simple plug-and-play system, due to higher costs and installation complexity.
- Cooling Capacity:12,000 BTU
- SEER2:18
- HSPF2:9
- EER2:8.5
- Voltage:230V
- Coverage Area:up to 550 sq. ft.
Bottom line: This system is perfect for those wanting a stylish, energy-efficient backup cooling option in medium-sized spaces.
COSTWAY 11500 BTU Mini Split Air Conditioner, 115V 17 SEER2 Wi-Fi Enabled Inverter System with Heater & Installation Kit
The COSTWAY 11500 BTU unit provides impressive capacity for spaces up to 750 sq.ft., making it a strong contender for larger areas compared to the smaller units. Its 17 SEER2 inverter technology ensures decent energy efficiency, while Wi-Fi compatibility with Alexa and Google Assistant offers convenient remote control. Compared to the Daikin or MEPTY, it provides greater coverage but at the expense of slightly higher noise levels and less refined aesthetics. The requirement for professional installation and complex setup may be a hurdle for some, yet its ability to cool and heat large spaces makes it suitable for backup use in bigger homes or commercial settings.
Pros:- Cools and heats up to 750 sq. ft.
- Wi-Fi enabled with Alexa and Google Assistant
- Energy-efficient inverter technology
Cons:- Requires professional installation
- Complex setup may be challenging for non-experts
Best for: Homeowners with larger spaces up to 750 sq.ft. seeking smart, energy-efficient backup cooling and heating.
Not ideal for: Small rooms or those preferring simple, plug-and-play units without the need for professional installation.
- Cooling Capacity:11500 BTU
- SEER2:17
- Voltage:115V
- Coverage Area:750 sq. ft
- Refrigerant:R32
- Modes:auto, cool, heat, dry, fan
- Self-cleaning:Yes
Bottom line: This unit is well-suited for larger spaces where smart control and energy efficiency are priorities in backup cooling.
Mini Split AC/Heating System – 18000 BTU Wall Mounted Ductless Air Conditioner with Heat Pump, 19 SEER2, 230V
This system stands out for its impressive 18000 BTU cooling capacity combined with 19 SEER2 energy efficiency, making it a reliable choice for larger spaces up to 1250 sq ft. Unlike smaller models like the Senville LETO, it handles bigger areas with ease, though its higher wattage and 230V requirement demand a robust electrical setup. Quiet at 46dB, it minimizes noise disturbance, which is a key advantage over louder units. The inclusion of heating and multiple modes offers year-round comfort, but professional installation is necessary, adding to initial costs. Compared to smaller units, this model trades portability and ease of installation for higher capacity and efficiency. It’s ideal for homeowners needing a robust backup cooling option that can also heat, provided their electrical system can support it.Pros:- High cooling capacity suitable for large spaces
- Energy-efficient with 19 SEER2 rating reduces energy costs
- Quiet operation ideal for bedrooms and living rooms
- Provides both cooling and heating for all-season comfort
Cons:- Requires professional installation and a 230V outlet
- Higher wattage might be incompatible with some electrical systems
- Limited to indoor use; outdoor unit needed
Best for: Homeowners with larger living spaces up to 1250 sq ft seeking reliable backup cooling and heating
Not ideal for: Small apartments or spaces with limited electrical capacity, due to its high wattage and installation complexity
- Cooling Power:18000 BTU
- Heating Power:18400 BTU
- SEER2:19
- HSPF2:8.5
- Room Size:up to 1250 sq ft
- Voltage:230V
- Wattage:1700W
- Noise Level:46dB
- Installation Type:Split System
Bottom line: This mini split is best suited for larger homes needing a powerful, energy-efficient backup system that can handle year-round climate control.
Senville LETO Series Mini Split Air Conditioner Heat Pump, 9000 BTU, 110/120V, Inverter, Alexa Compatible, SEER2 21.5, White
The Senville LETO Series balances energy efficiency with smart features, boasting a 21.5 SEER2 rating that outperforms many larger units like the 18000 BTU model for smaller, more manageable spaces. Its 9000 BTU capacity makes it ideal for rooms up to about 350 sq ft, making it a better fit for apartments or secondary rooms. The inverter technology ensures smooth operation and energy savings, but its heating capability down to only 5°F limits its cold climate use, unlike the larger unit that offers more robust heating. The inclusion of Alexa compatibility offers modern convenience, yet the lower capacity means it’s not suited for larger areas or as a primary backup in bigger homes. It’s a smart, compact option for those focused on efficiency and connectivity for small spaces.Pros:- High SEER2 rating (21.5) for excellent energy efficiency
- Smart voice control compatible with Alexa
- Includes comprehensive installation kit for ease of setup
- Inverter technology ensures quiet, smooth operation
Cons:- Limited heating ability, only down to 5°F
- Lower capacity not suitable for large spaces or primary cooling
- Requires professional installation and compatible electrical setup
Best for: Apartment dwellers or homeowners needing a smart, space-efficient backup cooling system for small rooms
Not ideal for: Large households or bigger spaces where higher BTU capacity is required for effective backup cooling
- BTU:9000
- Voltage:110/120V
- SEER2:21.5
- Color:White
- Includes:Indoor air handler, outdoor condenser, remote, installation kit
- Refrigerant Length:up to 25 ft
- Heating Functionality:Yes (up to 5°F/-15°C)
Bottom line: This unit is ideal for small spaces where smart control and energy efficiency are priorities over capacity, making it a good backup option for apartments or secondary rooms.
How We Picked
I evaluated these mini split systems based on performance metrics like cooling capacity (BTU) and SEER2 ratings, which directly influence energy efficiency and cooling effectiveness. Ease of installation, build quality, and compatibility with smart home systems also played key roles in the selection process. Cost was a factor, but priority was given to models offering a solid balance of efficiency, usability, and durability. Products are ranked to reflect overall performance for backup cooling, ensuring they meet the demands of different space sizes and user preferences without sacrificing reliability or ease of use.Factors to Consider When Choosing Best Mini Split Air Conditioner For Efficient Backup Cooling
Choosing the best mini split air conditioner for backup cooling involves considering several critical factors beyond just capacity and efficiency. Understanding these factors can help you avoid common pitfalls like undersizing or overpaying for unnecessary features. The right model depends on your space, budget, and how you plan to use the system, whether as a primary or backup cooling source.Cooling Capacity (BTU)
Matching the BTU rating to your space size is vital for effective backup cooling. Too small, and the system will struggle; too large, and it may cycle inefficiently, wasting energy. Consider the room dimensions and insulation levels to select a unit that provides reliable cooling without excessive power consumption. Larger capacities also tend to cost more upfront, so balance your needs with your budget.
Energy Efficiency (SEER2 Ratings)
Higher SEER2 ratings translate to lower running costs and better long-term savings, especially if the system will run frequently for backup cooling. While premium models often feature SEER2 ratings above 20, keep in mind that these come with a higher initial purchase price. For backup purposes, a slightly lower SEER2 might suffice if cost is a primary concern, but sacrificing efficiency can lead to higher energy bills over time.
Smart Features and Connectivity
WiFi control and smart home integration are increasingly common, making operation more convenient and allowing remote adjustments during outages or irregular use. However, these features tend to add to the cost and potential points of failure. If ease of use and remote management are priorities, investing in models with smart capabilities makes sense, but for simpler setups, basic units may suffice.
Installation and Maintenance
Ease of installation varies widely between models; units with comprehensive installation kits and clear instructions reduce setup hassle. Maintenance considerations include filter accessibility and build quality, which affect durability and service life. DIY-friendly models can save costs, but professional installation might be necessary for larger units or complex setups, adding to the total cost.
Price and Value
While higher-priced models often offer better efficiency, features, and durability, they may not be necessary for all users. Determine your budget and consider long-term savings on energy bills when evaluating costs. Sometimes, spending a bit more initially results in lower operational expenses and higher reliability, especially for backup systems that need to perform consistently during outages.
Frequently Asked Questions
How do I choose the right BTU capacity for my space?
Determining the correct BTU capacity involves measuring your room’s square footage, considering insulation quality, and the typical climate in your area. A rule of thumb is about 20 BTUs per square foot for moderate climates, but larger or poorly insulated spaces may require higher ratings. Overestimating capacity can lead to short cycling, which wastes energy and reduces equipment lifespan. Conversely, undersized units won’t cool effectively during backup needs, so accuracy in sizing is essential for reliable performance.
Are smart features worth paying extra for in a backup mini split system?
Smart features like WiFi connectivity and app control can add significant convenience, especially if you need to manage the system remotely or during outages. These functions make it easier to monitor performance, schedule operation, and troubleshoot issues without physical access. However, they also tend to increase upfront costs and can introduce additional points of failure. If you prioritize straightforward, reliable backup cooling with minimal fuss, a basic model might be more appropriate.
Can I install a mini split myself, or should I hire a professional?
Many mini split systems are designed for DIY installation, especially those with comprehensive kits and clear instructions. However, proper refrigerant handling, electrical wiring, and securing the indoor and outdoor units require technical knowledge. For larger units or if local codes demand, professional installation is advisable to ensure safety, compliance, and optimal performance. Investing in professional setup can prevent costly mistakes and extend the system’s lifespan.
What features should I look for to maximize energy savings?
Focus on models with high SEER2 ratings and inverter technology, which allow the compressor to modulate speed based on cooling demand, reducing energy consumption. Features like programmable timers, smart controls, and occupancy sensors can further optimize operation and prevent unnecessary running during periods when backup cooling isn’t needed. While these features may increase initial costs, they often lead to lower utility bills over time, making them worthwhile investments.
How important is noise level in choosing a backup mini split system?
Noise level can be a significant factor if the system will operate in or near living or sleeping areas. Modern mini splits are generally quiet, but some models are quieter than others, with lower decibel ratings. Consider the placement of the outdoor unit and the specific noise ratings provided by manufacturers. Choosing a quieter model enhances comfort and reduces disturbance during operation, especially during nighttime use or in sensitive environments.
