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Honeywell TH6210U2001 T6 Pro Programmable Thermostat is ideal for standard efficient gas forced air, high efficacy gas forced air, oil forced air, electric forced air, hot water fan coil, geothermal heat pump, air to air heat. This thermostat is capable of controlling up to two heat and one cool stages of heat pump, and up to one heat and one cool stages of conventional system (2H/1C Heat Pump, 1H/1C Conventional).