Patent ID: 7410104

Claim:
A method of heating a desired area in a building having at least one room, the method comprising: providing an air-to liquid heat exchanger installed within a hot air duct connected to a forced air furnace, the air-to-liquid heat exchanger installed downstream from the forced air furnace; arranging a radiant heating loop below a floor surface to heat the desired area and operatively connecting the radiant heating loop to the air-to- liquid heat exchanger such that heating liquid can be circulated through the air-to-liquid heat exchanger, through the radiant heating loop, and back through the air-to-liquid heat exchanger; operating the forced air furnace to blow heated air through the hot air duct, past the air-to-liquid heat exchanger, and disperse the heated air into the at least one room of the building; and circulating heating through the air-to-liquid heat exchanger and the radiant heating loop.