The MRCOOL DIY-18-HP-WM-230C25 DIY 4th Gen Energy Star 18K BTU Ductless Mini-Split Heat Pump System is a high-efficiency heating and cooling solution designed for residential and light commercial applications. This ductless system transfers heat between indoor and outdoor units using advanced heat pump technology to provide year-round temperature control. It is ideal for single rooms, additions, garages, offices, and spaces without existing ductwork.