A heat pump is an air conditioner that provides heating and cooling. It works by transferring heat between the inside and outside air. In the summer, the heat pump works like an AC unit, just like a traditional air conditioner. In the winter, it reverses this process, effectively moving heat from outdoors to indoors to heat your space. Heat pumps are highly efficient for both heating and cooling, making them a good alternative to traditional furnaces and air conditioners, especially in mild to moderate climates.