Heat transfer apparatus

Heat transfer apparatus comprising:

• a first heat exchanger for positioning in the flue of a furnace;
• a second heat exchanger for positioning in the fan chamber of the furnace;
• first means for coupling said first heat exchanger in a first fluid circulation loop with a water heater;
• second means for coupling said first and second heat exchangers together in a second fluid circulation loop;
• valve means for selectively permitting fluid flow in said first or second loops during a heating mode of operation;
• and
• third means for selectively coupling said second heat exchanger to a source of cold water for providing cooling to air flowing through the fan chamber during a cooling mode of operation.

Heat transfer apparatus for use in a forced air heating/cooling system comprising:

• a first heat exchanger for positioning in the flue of the heating/cooling system;
• a second heat exchanger for positioning in the fan chamber of the heating/cooling system;
• conduit means coupling said first and second heat exchangers in a circulatory loop;
• selectively actuated pump means for circulating fluid in said loop when the heating/cooling system is in a heating mode of operation thereby transferring heat from the flue into the air flow path in the fan chamber;
• a source of cooling fluid;
• and
• valve means for selectively blocking said loop and coupling said second heat exchanger to said source when the heating/cooling system is in a cooling mode of operation.