In
the spring and fall, the heat pump extracts heat from the
outside air and pumps it into the house, warming the house
more efficiently than with electric resistance heat. Even
winter air contains a substantial amount of heat.
On
cold winter days and nights (below 30 or 40 degrees
Fahrenheit) back-up heat from the fossil fuel furnace is
used.
In
the summer, the heat pump reverses its cycle and acts as a
central air conditioner, extracting heat from inside your
home and pumping it outside. A Dual Fuel system will cool
and dehumidify your entire house.