The MRCOOL 4th Generation DIY 24K BTU, 20.5 SEER Ductless Heat Pump is an all in one system that seamlessly combines efficiency, durability, and simplicity. This system can offer a 20.5 SEER efficiency rating that has allowed it to achievean Energy Star certification and can heat & cool an area up to 1,000 sq. ft. It also features durable construction and a corrosion-resistant Gold Fin condenser. All of this is contained within a Do-It-Yourself system that can be installed by a homeowner in a few hours using simple tools. This simplicity is achieved with the use of the patented MrCool Pre-Charged Quick-Connect Line Set included with the system.