“What is the difference between Honeywell TH8321WF1001 and RTH9585WF”
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Hi, the TH8321WF1001 Thermostat is designed for trade use and offers a broader range of application compatibility than the RTH9585WF Thermostat. It includes the ability to control a whole house humidifier/dehumidifier and ventilation system. The RTH9585WF Thermostat works with forced air heating systems (gas, oil or electric), hot water/steam systems, and heat pump systems that have electric backup. -Jerry
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