Excellent points so far.
Also to OP: when in doubt: it never hurts to replace any digital thermostat that have been in place for 5+years, for they will fail eventually (causing all sorts of misbehaviours).
I dumped those mercury switch-based (not in the landfill, of course!) Honeywell and replaced them with RiteTemp digital thermostats and been very happy so far.
Q.
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