Best 12000 BTU Mini Split 21 Seer in 2025
Updated on August 2025
#1
Recommended
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- Alexa compatibility for remote temperature adjustments via voice or app.
- Multi-functional system that provides air conditioning, heating, dehumidifying, and fan options, operational down to 5F/-15C, and includes a DC Inverter.
- Designed for both residential and commercial use, balancing efficiency and aesthetic appeal.
- Comprehensive installation package with all necessary components and pre-charged refrigerant for installation up to 25 ft; professional installation recommended.
- 5-year warranty on parts and compressor, with additional technical support from the manufacturer.
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- Alexa compatibility for remote temperature adjustments via voice or app.
- Multi-functional system that provides air conditioning, heating, dehumidifying, and fan options, operational down to 5F/-15C, and includes a DC Inverter.
- Designed for both residential and commercial use, balancing efficiency and aesthetic appeal.
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#2
Value for Money
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- This air conditioner and heater unit has a capacity of 12000 BTU/h, an efficiency rating of 19 SEER2, and operates on 208-230V with an 8 HSPF rating, designed for ductless mini-split installation and capable of functioning in temperatures as low as -4℉/-20℃.
- Equipped with a variety of smart settings including auto defrost, self-diagnosis, 24-hour timer, sleep mode, eco mode, and multiple fan speeds for enhanced usability. Requires a maximum fuse size of 15A for operation.
- Features a smart sensor that detects room temperature from the remote control for better temperature regulation and energy efficiency during operation.
- Operates quietly at sound levels of 30-41 dBa and provides consistent airflow throughout the room, with an adjustable temperature range of 60-90 degrees Fahrenheit. Requires professional installation due to line-set vacuuming and freon adjustments.
- Designed to heat and cool spaces up to 750 square feet and includes a full installation kit with 16.4 ft of standard size copper pipes, plus a drain pipe length of 78.7".
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- This air conditioner and heater unit has a capacity of 12000 BTU/h, an efficiency rating of 19 SEER2, and operates on 208-230V with an 8 HSPF rating, designed for ductless mini-split installation and capable of functioning in temperatures as low as -4℉/-20℃.
- Equipped with a variety of smart settings including auto defrost, self-diagnosis, 24-hour timer, sleep mode, eco mode, and multiple fan speeds for enhanced usability. Requires a maximum fuse size of 15A for operation.
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#3
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- 12,000 BTU performance and SEER2 21 inverter technology for efficient cooling and heating, suitable for spaces up to 750 sq.ft.
- Includes a complete DIY installation kit with pre-charged line set, drain hose, and step-by-step manual for easy setup.
- Built-in WiFi allows for remote control and 24-hour programming, featuring sleep mode, turbo cool, and auto-restart functions.
- Operates at noise levels as low as 32dB, making it suitable for bedrooms and quiet work environments.
- Constructed with R32 refrigerant and anti-corrosion protection, including a 5-year compressor warranty for durability.
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- 12,000 BTU performance and SEER2 21 inverter technology for efficient cooling and heating, suitable for spaces up to 750 sq.ft.
- Includes a complete DIY installation kit with pre-charged line set, drain hose, and step-by-step manual for easy setup.
- Built-in WiFi allows for remote control and 24-hour programming, featuring sleep mode, turbo cool, and auto-restart functions.
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#4
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- High-performance 12000 BTU system for effective cooling and heating in spaces up to 550 sq.ft.
- Inverter technology with 21 SEER rating and R454B refrigerant provides energy savings of up to 35%.
- Operates at a quiet 28dB in mute mode, ensuring a peaceful indoor environment.
- Compatible with remote control, phone app, and voice assistants for convenient operation and temperature adjustments.
- Professional installation is recommended; includes necessary components but may require additional power cord.
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- High-performance 12000 BTU system for effective cooling and heating in spaces up to 550 sq.ft.
- Inverter technology with 21 SEER rating and R454B refrigerant provides energy savings of up to 35%.
- Operates at a quiet 28dB in mute mode, ensuring a peaceful indoor environment.
- Compatible with remote control, phone app, and voice assistants for convenient operation and temperature adjustments.
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#5
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- 4-in-1 mini split AC unit with cooling, heating, dehumidification, and fan modes, including temperature display, turbo, sleep mode, and 24-hour timer, adjustable temperature range of 60℉-90℉ and 353 CFM airflow suitable for homes and commercial spaces.
- 12,000 BTU cooling and 12,300 BTU heating capacity covering up to 750 sq.ft. Outdoor unit operates efficiently in temperatures between 14℉ and 122℉, ensuring reliability in extreme conditions.
- Inverter technology for energy efficiency, maintaining the set temperature with lower energy costs. Rated 21 SEER2 and 10 HSPF2, ETL approved, and AHRI certified for dependable performance.
- Built-in self-cleaning function at 135℉ that includes condensation, sterilization, and ventilation, plus removable and washable filters for easy maintenance.
- Includes indoor and outdoor units, remote control with 26 ft range and child lock, and installation kit with 13 ft copper piping. Requires installation by a licensed HVAC professional.
- Uses R32 refrigerant, an eco-friendly choice compared to older refrigerants. Ensure R32 availability for any needed refills.
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- 4-in-1 mini split AC unit with cooling, heating, dehumidification, and fan modes, including temperature display, turbo, sleep mode, and 24-hour timer, adjustable temperature range of 60℉-90℉ and 353 CFM airflow suitable for homes and commercial spaces.
- 12,000 BTU cooling and 12,300 BTU heating capacity covering up to 750 sq.ft. Outdoor unit operates efficiently in temperatures between 14℉ and 122℉, ensuring reliability in extreme conditions.
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#6
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- Powerful 12000 BTU cooling with an energy-efficient SEER rating of 21.
- Remote management via WiFi for added convenience and smart home integration.
- Designed for quiet operation, making it suitable for bedrooms and living areas.
- Functions as an air conditioner and auxiliary heat pump for year-round climate control.
- Uses 230V power technology for effective cooling while minimizing energy use.
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- Powerful 12000 BTU cooling with an energy-efficient SEER rating of 21.
- Remote management via WiFi for added convenience and smart home integration.
- Designed for quiet operation, making it suitable for bedrooms and living areas.
- Functions as an air conditioner and auxiliary heat pump for year-round climate control.
- Uses 230V power technology for effective cooling while minimizing energy use.
#7
5% Off
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- 4-in-1 Mini Split System with air conditioning, heat pump, dehumidifier, and fan functions for year-round comfort.
- Operates efficiently in extreme temperatures ranging from -13°F to 131°F, suitable for various environments including residential and commercial spaces.
- Energy-efficient inverter technology with a 23 SEER rating allows for significant savings on energy bills while maintaining high performance.
- Produces minimal noise at just 27 dBa in Mute Mode, with a 24-hour timer and a display screen that can be turned off for undisturbed sleep.
- Includes all necessary components for installation; professional installation is recommended to ensure safety and performance.
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- 4-in-1 Mini Split System with air conditioning, heat pump, dehumidifier, and fan functions for year-round comfort.
- Operates efficiently in extreme temperatures ranging from -13°F to 131°F, suitable for various environments including residential and commercial spaces.
- Energy-efficient inverter technology with a 23 SEER rating allows for significant savings on energy bills while maintaining high performance.
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#8
10% Off
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- Inverter mini split air conditioner provides efficient cooling and heating for spaces up to 750 sq. ft., saving up to 25% on energy costs compared to traditional models.
- Features five operational modes (Auto, Cooling, Drying, Heating, Fan) and four fan speeds, with remote control, WiFi, and Alexa integration for easy access.
- Operates quietly at under 41 dB, suited for noise-sensitive areas, with remote temperature control, 0-24h timer, sleep mode, and display-off feature.
- Operates effectively in temperatures ranging from 5°F to 118°F, ensuring consistent comfort with 4D air circulation and powerful airflow.
- Includes all necessary components for installation, such as indoor and outdoor units and a remote control, requiring a licensed HVAC professional for setup.
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- Inverter mini split air conditioner provides efficient cooling and heating for spaces up to 750 sq. ft., saving up to 25% on energy costs compared to traditional models.
- Features five operational modes (Auto, Cooling, Drying, Heating, Fan) and four fan speeds, with remote control, WiFi, and Alexa integration for easy access.
- Operates quietly at under 41 dB, suited for noise-sensitive areas, with remote temperature control, 0-24h timer, sleep mode, and display-off feature.
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#9
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- Energy Star certified with 21 SEER2 rating, this mini split AC optimizes energy consumption and reduces electricity costs while lowering carbon emissions.
- Control your AC remotely through an app or voice commands, allowing for easy adjustments and energy limit settings from anywhere.
- The 4-in-1 system provides cooling, dehumidifying, heating, and fan modes, featuring a temperature range of 60℉-90℉ and options like turbo and sleep modes.
- Utilizes eco-friendly R32 refrigerant, ensuring efficient heating and cooling while minimizing environmental impact; local suppliers can provide R32 for refills.
- Equipped with removable, washable filters and modular components for straightforward maintenance, extending the unit's lifespan.
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- Energy Star certified with 21 SEER2 rating, this mini split AC optimizes energy consumption and reduces electricity costs while lowering carbon emissions.
- Control your AC remotely through an app or voice commands, allowing for easy adjustments and energy limit settings from anywhere.
- The 4-in-1 system provides cooling, dehumidifying, heating, and fan modes, featuring a temperature range of 60℉-90℉ and options like turbo and sleep modes.
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#10
9% Off
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- 12,000 BTU mini split air conditioner with inverter technology suitable for rooms up to 550 square feet.
- Inverter technology with a SEER rating of 21 offers energy savings of up to 35%, using environmentally-friendly R454B refrigerant.
- Remote control allows for easy operation, including fan speed selection, sleep mode, 24-hour timer, ECO mode, turbo mode, and mute mode.
- Operates quietly at 28-45 dBa, includes a 4-way swing function for effective airflow distribution throughout the room.
- Professional installation recommended, ideal for home, office, or light commercial use.
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- 12,000 BTU mini split air conditioner with inverter technology suitable for rooms up to 550 square feet.
- Inverter technology with a SEER rating of 21 offers energy savings of up to 35%, using environmentally-friendly R454B refrigerant.
- Remote control allows for easy operation, including fan speed selection, sleep mode, 24-hour timer, ECO mode, turbo mode, and mute mode.
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