A window you'd rather keep clear and a room that still needs real cooling is the problem the Keystone 12,000 BTU Through-The-Wall 230V Air Conditioner solves. It sits in a sealed wall opening all year, so you never have to set it up and take it down each season. Apartments, offices, and bedrooms are the natural fit. It comes in Cool Only and Cool/Heat configurations. Key Features and Benefits of the Keystone 12,000 BTU Through-The-Wall 230V Air Conditioner Cooling Output: Rated at 12,000 BTU per hour, enough for rooms up to 550 square feet on hot afternoons. Refrigerant and Range: Uses R-32 refrigerant, the cooling medium inside, and lets you set the thermostat from 60 to 90 degrees F for your exact comfort level. Dual Controls: Adjust settings on the LED display panel or with the included wireless remote, whose Follow Me sensor reads the temperature right where you're sitting. Dry Mode: Removes up to 2.5 pints of moisture per hour, so you can take the clammy feel out of a humid room without overcooling it. Eco and Sleep: Eco Mode shuts the air conditioner down once your set temperature is reached, and Sleep Mode slowly raises the temperature while you sleep. 24-Hour Timer: The programmable timer runs cooling or heating on your schedule, so the room is comfortable by the time you walk in. 3 Fan Speeds: Choose from 3 speeds, running from 56.5 dB on low to 60.5 dB on high (61.5 dB for model KSTAT12-2HD), about as loud as normal conversation. Airflow Options: Fan-only mode and adjustable louvers let you move and aim air where you want it without running the compressor. Auto Restart: Auto Restart saves your settings and brings them back after a power outage, so you never have to reprogram the air conditioner. Slide-Out Chassis: The slide-out chassis fits a through-wall opening of 25.5 x 17.5 x 15.25-Inches (L x W x H) and installs with the included kit and instructions. 230V Power: Draws 208-230 volts through a NEMA 6-15P plug on a cord 6.5 feet long, so you need a 20-amp outlet, not a standard 115V outlet. Size and Safety: Measures 20.3 x 24.2 x 14.5-Inches (L x W x H), weighs 78 pounds, and carries UL certification for electrical safety. Cool Only vs. Cool/Heat: Choose Your Configuration You can get this air conditioner as a Cool Only model or as a Cool/Heat model with a supplemental heat pump. Cool Only Model KSTAT12-2D: This model is built for cooling alone, with a 10.5 EER (cooling output per watt of power) and airflow of 286 cubic feet per minute (CFM) at a maximum of 1,142 watts, for an estimated yearly operating cost of $111. Cool/Heat Model KSTAT12-2HD: This model pairs cooling with a supplemental heat pump that provides 10,600 BTU of heating for outdoor temperatures from 23 to 76 degrees F, drawing up to 3,450 watts and 15 amps in heat mode, so plan your circuit around that load. In cooling, it moves 300 CFM of air per minute at a maximum of 1,220 watts, with a 9.5 EER (cooling output per watt of power) and an estimated yearly operating cost of $123. Sylvane's Expert Take If you're replacing an old sleeve-mounted air conditioner in an apartment or condo, check your wall opening and outlet before anything else, because those 2 things decide whether this model works for you. Go with the Cool Only model if a furnace or boiler already heats the room, since it runs more efficiently. The Cool/Heat model is worth it in spring and fall, when it can warm a cool room so you can leave your main heating off a little longer.