What heating and cooling system configurations does the TH8320U support?
The TH8320U thermostat supports up to 3 Heat/2 Cool systems. It is compatible with gas, oil, or electric heat with air conditioning, heat pump systems, hot water systems, steam systems, and cool-only systems. The thermostat can also work with two-wire systems and zone valves for multi-zone heating control.
From the official Honeywell T8320U Programmable Thermostat manual, page 1
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