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what are the dimensions on the to see if it will cover the same or better larger area on the old thermostateA. The Honeywell TH8110U1003 is 1 1/4" thick, 6" wide x 4 9/16" tall.
Does the TH8110U003 have a System Heat Auto Cool feature?A. The Honeywell TH8110U1003 Thermostat does have a System Heat Auto Control feature, it is function 300, option #1.