How do I identify which model thermostat I have?
Pull the thermostat from the wallplate and turn it over to find the model number on the back. The TH8320U is designed for up to 3 Heat/2 Cool systems, while the TH8110U is for 1 Heat/1 Cool systems and the TH8321U includes dehumidification capabilities.
From the official Honeywell T8320U Programmable Thermostat manual, page 1
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