Since both the T8411R (downstairs unit) and the old Trane (upstairs unit) thermostats require manual switching to Emergency Heat, how do I know when to switch over? The guy who installed the thermostat just said to switch over when the temperature stayed below freezing for several days. What happens if I'm not home for a week when it is freezing?
Never had a heat pump before and recently moved to a 15 year old house with no manuals available for equipment.
Should I consider switching to programmable thermostats?