Emerson Quiet Kool 12,000 BTU 230V Through-the-Wall Air Conditioner is the perfect air-conditioning solution for your home or office. Designed for rooms up to 550-sq. ft. This unit is designed for through-the-wall installation and is not designed for standard window installation. It will fit most existing wall sleeves (including our competitors) and includes a decorative interior trim kit. Plus, quiet operation keeps you cool without keeping you awake. And for peace of mind, you get our 1-2-5 years warranty: 1 year labor, 2 years parts and 5 years compressor. Emerson Quiet Kool air conditioners are a great way to beat the heat and stay comfortable.