I live in Dallas, GA (nw GA) and about to replace the original 17 yo Ruud a/c unit and 3 ton furnace simultaneously. An American Standard owner/operator/installer is suggesting a duel-fuel heat pump w/variable speed blower/furnace. I hesitate to consider a heat pump only because we lived in an apartment 18 yrs ago with a heat pump that ran all of the time and never seemed to bring the heat up to a temp that was comfortable. I know technology has changed but is the added expense of the heat pump worth it and will it keep the house just as warm as a gas furnace? The A.S. owner tells me that there is an outside temp adjustment that can be made on the unit that kicks the gas furnace on at the preset temp (i.e. 20-30 F).