Ideal for warmer climates, a heat pump is an all-in-one cooling and heating system. During summer months, it works like an air conditioner, moving heat from inside your home to the outdoors. When the weather's cooler, it does the opposite, taking heat from outside and moving it inside. The Lennox® XP17 heat pump comes SunSource® Solar-Ready, which means it can be enhanced to act as a platform for a money-saving solar energy system.