Your new MRCOOL DIY 48k BTU 20.5 SEER 3-Zone Ductless Heat Pump Split System-12k+18k+18k is an easy-to-install, highly efficient system to handle all of your heating and cooling needs in 3 rooms in your home. Acting as a heat pump, the 48k BTU outdoor unit will use a reverse air conditioning process to draw in air from outside to heat your home in 3 areas. Boasting a 21.5 SEER, thanks in part to the variable speed DC inverter, each of the 18k BTU wall-mounted indoor air handlers can heat or cool an area up to 750 sq. ft. The 12k BTU handler is capable of heating or cooling a space up to 500 sq. ft. Color: White.