12000 Btu cooling and 11000 Btu heating commercial grade WallMaster 230/208v thru-the-wall room air conditioner with electric heat has an EER of 9.4 and installs through walls up to 15 5/16" deep to condition rooms up to approximately 550 sq ft. * Fits Fedders A and Fedders B sleeves with baffle adapter kit * 24-hour timer lets you program on & off times * Smart Fan auto adjusts fan speed to maintain desired temperature * Money Saver®saves money by operating the fan only when cooling * 12000 Btu cooling and 11000 Btu heating commercial grade Wall Master 230/208v thru-the-wall room air conditioner with electric heat has an EER of 9.4 and installs through walls up to 15 5/16" deep to condition rooms up to approximately 550 sq ft * 24-hour timer lets you program on and off times * Fits Feeders A and Feeders B sleeves with baffle adapter kit * Money Saver saves money by operating the fan only when cooling