The MRCOOL DIY-12-HP-WM-115C25 DIY 4th Gen E-Star 12K BTU Ductless Mini-Split Heat Pump is a high-efficiency HVAC system designed to provide reliable heating and cooling for residential spaces without the need for ductwork. It works by transferring heat between the indoor and outdoor units, delivering consistent indoor comfort while minimizing energy consumption. This ductless mini-split system includes an indoor air handler and outdoor condenser, making it ideal for homes, additions, garages, and offices. Its DIY-friendly installation, energy efficiency, quiet operation, and year-round climate control offer convenience, lower utility costs, and enhanced comfort.