Hi Everyone- can one of the experts here let me know how to increase the fan run time for my Rheem furnace. I find that with the current fan run time after the initial heating cycle is over there is allot of warm air still in the vents, by warm I mean very hot air, I would like to find out if I can increase the blower time to lets say an extra 60 to 90 seconds to get most of that hot air into the space rather than having it cool down in the ducts. I have a Totaline thermostat and by reading the manual I know this can be done via the thermostat for cooling cycles but no mention of heating cycles... any ideas? My house has 5 furnaces and I would like to get the most out of it since I am paying an arm and a leg for gas!!!