Napolean’s NS18 heat pump and air handler is an all-in-one heating and cooling system for year-round comfort. The heat pump features a variable inverter compressor and vapor injection technology to heat a home in temperatures as low as -22° F and cool it on sweltering days as hot as 129° F. It also operates on electricity, helping homeowners reduce their carbon footprint without sacrificing comfort and reducing energy costs, Napolean notes.