A heat pump is a device that moves heat from one place to another. In the summer, a heat pump can be used like an air conditioner, moving heat from the inside of your home to the outside. In the winter, a heat pump can be used to move heat from the outside of your home to the inside. This heat can come from the ground, or from the air. A heat pump uses a small amount of electricity to move this heat. This makes heat pumps much more efficient than other types of heating, like electric furnaces. Heat pumps are most commonly used for heating and cooling homes, but they can also be used for other applications like pools and hot tubs. When used for heating a home, a heat pump can provide up to four times the amount of heat than what is provided by the electricity it uses.