What is the difference between the TH8320U and the TH8321U models?
The TH8321U supports up to 3 Heat/2 Cool systems with dehumidification, while the TH8320U supports up to 3 Heat/2 Cool systems without dehumidification. Both models are covered in the same installation guide. (Page 1)
From the official Honeywell Th8320U1008 Thermostat manual, page 1
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