What is the difference contained by the Honeywell Programmable Thermostats? How do I know which VisionPro model to buy?

I know I have two stage heat - Heat Pump and Gas. I also have a humidifier on one of the two systems. Should I bring one TH8321U1006 for the system with the humidifier and one TH8320U1008 for the system short a humidifier?


Answers:    i dont directly know those models, but i have worked next to a lot of hvac controls, i enjoy used visionpro t-stats before beside heat pumps. i would recommend calling a local hvac supply store relate them your problem they will usually help. dont mention your a homeowner or they will refer you to a contracter, if they wont donate you info, try having your wife or girlfriend send for
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