For more flexibility, a multizone programmable thermostat can vary temperatures in different areas of a building at different times to suit the needs of the occupants. The cost of a setback thermostat typically increases with the addition of optional features. Battery backup to keep the timer on schedule in case power is interrupted. An override function that lets you temporarily change the preselected program. A locking device or cover to prevent unauthorized changes to the program.
Setback thermostats work best with forced-air heating and air conditioning systems.
You should consult with your contractor before installing one on infrared, heat pump or hot water heating systems.