The MRCOOL 4th Generation DIY 18K BTU, 22 SEER Ductless Heat Pump system offers a complete solution to your home's heating and cooling needs. This system can heat & cool an area up to 750 sq. ft. and is capable of an Energy Star certified,22 SEER efficiency rating. However, the best feature of this system is the ease of installation it provides to the homeowner. With the included pre-charged 25 ft. line set, some hand tools, and a few hours of time this entire system can becompletely installed.