Said they were having problems with 3 of the thermostats, found the batteries to be corroded in one and the batteries to be kinda loose in another, changed center thermostat to emergency heat as I think that system isn't keeping up at night cause colder than normal temps in the other areas, tested all operations and checked programming on all three thermostats and found no other issues, gave instructions to have them call back in tomorrow if nothing changed, all operations ok at this time.