HOT ! Keystone - 12, 000 BTU Through the Wall Heat/Cool, R32 - KSTAT12-2HD

Keystone - 12, 000 BTU Through the Wall Heat/Cool, R32  -  KSTAT12-2HD

The Keystone 12,000 BTU 230V through-the-wall air conditioner with 10,600 BTU Supplemental Heat Capability is perfect for rooms up to 550 square feet. In addition to cooling, this versatile unit also offers supplemental heat capability, providing you with an additional heat source to your main heat source when outdoor temperatures are above 23 degrees Fahrenheit. It has electronic controls with LED display and a temperature sensing LCD remote control allowing you to conveniently see, set and maintain the room temperature from across the room. Money saving features include energy saver mode, sleep mode and a programmable 24-hour timer. This unit is designed for through-the-wall installation and is not designed for standard window installation (WALL SLEEVE SOLD SEPARATELY). This unit also requires a special 230-volt/20-amp electrical outlet and will not operate with a standard 115V household electrical outlet.

Features

• SUPERIOR COOLING AND HEATING: With a 9.5 energy efficiency ratio (EER), this 12,000 BTU through the wall air conditioner can effectively cool rooms up to 550 sq. ft and dehumidify up to 2.5 pints per hour. (Product is not suitable for window installation)


• 230-VOLT/20-AMP ELECTRICAL OUTLET REQUIRED: This air conditioner has a 6.5ft power cord with a NEMA 6-20P grounding plug that will not fit a standard 115V electrical outlet.


• TEMPERATURE SENSING FOLLOW ME REMOTE CONTROL: With a thermostat built into the remote control, say good-bye to uneven room temperatures. The remote makes it easier to control the unit from anywhere in the room and its integrated thermostat signals the AC to cool the space based on where you are.


• FRONT-ACCESS FILTER: Let’s face it. Filters collect dust. With our front-access design, cleaning that dusty filter is a piece of cake. Simply pull it out, vacuum or rinse and dry, and slide back into place. No hassle and no disassembly required.


• GUARANTEED FIT: This air conditioner will fit in your existing 24.5” to 27” sleeve. We guarantee it. At 20.3” D x 24.2” W x 14.5” H, we provide the foam seals and installation kit necessary to retrofit your existing sleeve. If you don’t have a sleeve,


• ENERGY-CONSCIOUS OPTIONS: While there are 3 cooling modes and 3 fan speeds pre-programmed, you have flexibility. The Auto option will automatically ramp up and down the fan speed to keep you’re pre-set temperature constant. The Energy-saver mode conserves energy and saves you money by turning off the compressor once your desired temperature is reached.


• Through-the-wall installation (Not suitable for window installation)


• Standard, universal interior trim kit for existing wall sleeve included (New wall sleeve sold separately: KSTSLV1)


• Special 230-volt/20-amp electrical outlet required (Unit will not work with a standard 115V outlet)


• 12,000 BTU cooling capacity / 10,600 BTU supplemental heating capacity


• Supplemental heat capability provides an additional heat source to your main heat source when outdoor temperatures are above 23°F


• Designed for a room up to 550 sq. ft.


• Dehumidification up to 2.5 pints per hour


• Electronic controls with LED display allows you to easily select options with the touch of a button


• Temperature sensing LCD remote control allows you control the temperature from across the room


• Auto-restart saves your settings for when power is restored to the unit


• Adjustable 4-way air flow direction allows you to easily control the direction of the cool air


• 3 cooling speeds, 3 fan speeds, and 1 heat speed


• Auto function determines the fan speed depending on the set temperature


• Programmable 24-hour on/off timer cools on your schedule


• Energy-saver mode conserves energy and saves you money


• Sleep mode gradually increases room temperature after being activated


• Easy-clean mesh filter with Check Filter alert on the unit


• 6.5 ft. power cord with NEMA 6-15P grounding plug makes extension cords unnecessary


• U.L. safety listing

Specifications

Downloads & Manual

• Specification Sheet


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  Product Manual
  


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  Warranty Guide
  


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  Energy Guide
  


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  CA Prop 65 Warning Label
  


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  CA Prop 65 Retail POP
  


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  Product Video
  


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  Custom Spec Sheet
  

What our Experts Think

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  Year-Round Comfort: Both heating and cooling in one unit—ideal for temperate climates and shoulder seasons.

  
  


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  Efficient R32 Refrigerant: Modern R32 delivers better heat transfer and lower environmental impact vs older refrigerants.

  
  


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  Perfect for Medium Rooms: 12,000 BTU capacity efficiently handles ~450–550 sq ft spaces.

  
  


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  Through-the-Wall Stability: Permanent installation minimizes noise and vibration while saving window/floor space.

  
  


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  User-Friendly Controls: Simple digital interface with multiple modes and fan speeds for personalized comfort.

  
  


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  Energy & Cost-Smart: Balanced performance helps reduce utility costs and appeals to energy-focused shoppers.

  
  


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  Low Maintenance: Washable filter and easy access make upkeep quick and inexpensive.

  
  

Q&A

Q: What functions does this unit provide?A: Cooling and heating in one through-the-wall system — year-round comfort.

Q: How much cooling/heating power?A: 12,000 BTU capacity suitable for medium to large rooms (approx. 550–700 sq. ft.).

Q: What refrigerant does it use?A: Uses environmentally friendlier R32 refrigerant for efficient, lower-impact performance.

Q: Is it energy efficient?A: Yes — optimized operation helps reduce energy use and utility costs.

Q: What controls are included?A: Easy-to-use electronic controls with adjustable thermostat and fan speeds.

Q: Is installation hardware included?A: Yes — comes with mounting template and hardware for through-the-wall installation (wall sleeve sold separately).

Q: Is it suitable for quiet environments?A: Yes — engineered for low-noise operation ideal for bedrooms and living spaces.

Maintenance Tips

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  Clean or rinse the washable air filter every 2–4 weeks to keep airflow strong and efficiency high

  
  


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  Wipe down the front grille and vents to prevent dust buildup that can strain the unit

  
  


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  Check and clear the condensate drain and ensure proper wall sleeve sealing to avoid moisture problems

  
  


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  Use heat/cool mode appropriately and set thermostat to reduce unnecessary runtime

  
  


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  Keep the area around the unit clear to promote optimal ventilation

  
  


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  Schedule an annual professional service to inspect refrigerant (R32), coils, and electrical components