The HYBRID HEAT® dual fuel system provides an economical solution to the rising uncertainty surrounding utility costs. Comprised of a heat pump, a furnace and a wall-mounted control, these systems deliver maximum energy efficiency by automatically choosing the most economical heating source during moderate heating conditions. Ultimate HYBRID HEAT dual fuel systems combine an Infinity® ICS gas furnace with our Infinity® 19 heat pump to provide soothing, superior comfort during both heat pump and furnace operation. This system is tied together by the Infinity® Zoning Control which is set to a "balance point" that tells it when best to select heat pump operation and when to choose furnace operation based on weather and utility costs in the area.