Rather than generating heat like a gas-powered space heater does, electric heat pumps move heat from one area to another. Heat pumps use fluids called refrigerants that are excellent at absorbing and releasing heat. They can absorb and concentrate heat from the atmosphere even when the temperature is very cold. When your home is cold, the heat pump moves heat from outside into your home. When your home is hot, a heat pump can cool it down by moving heat out of your home. This transfer of heat into and out of your home makes heat pumps much more efficient than a gas furnace (sometimes up to 300%), saving you energy and money and reducing greenhouse gas emissions.