Heat pumps differ from standard HVAC systems principally in their ability to transfer rather than generate heat. A heat pump transports heat from the outside air into your home, even in freezing weather, whereas a normal furnace burns fuel to generate heat. In the summer, the process reverses, removing heat from your home to keep it cool. Heat pumps are substantially more energy efficient since they move heat instead of generating it.
Furthermore, heat pump water heater run on electricity, which is a greener energy source than the fossil fuels generally used in traditional furnaces. Another notable advantage is that heat pumps provide both heating and cooling, eliminating the need for separate systems and lowering initial setup and maintenance expenses.