Quick answer
The control that tells your HVAC system when to run.
A thermostat senses indoor temperature and signals the HVAC system to heat or cool to your setpoint. Smart and programmable thermostats add scheduling, remote control, and automatic setbacks that save energy. Heat-pump and dual-fuel systems need thermostats that control backup heat correctly.
Why Thermostat matters
Control terms affect when the system runs, how efficiently it recovers, and whether special equipment like heat pumps or dual-fuel systems operate correctly.
When you'll see this term
You will usually hear this term during thermostat replacement, zoning, comfort complaints, and energy-saving setup.
Questions to ask your technician
- Is this control compatible with my equipment?
- Will it manage heat pump backup or dual-fuel switching correctly?
- Can you set it up so the energy-saving features actually work?
Go deeper
Are smart thermostats worth it?