Definition
A thermostat is the wall control that senses indoor temperature and tells heating and cooling equipment when to start and stop. Types include manual, programmable, Wi-Fi smart and communicating models. Thermostats for heat pumps also manage the reversing valve, auxiliary heat and emergency heat, and many control fan settings, humidity or system alerts.
Also called: Smart thermostat, Programmable thermostat
Why it matters to you
In a heating-dominant climate like SW Washington's, winter settings shape comfort and run time most of the year, and on a heat pump a large setback recovery can bring on electric auxiliary heat. Thermostats with adaptive recovery or an outdoor temperature input help keep a heat pump in its efficient range on cold, damp mornings.
Practical guidance
Homeowners can replace batteries, set schedules and keep the thermostat away from sun, lamps and supply registers. Confirm a new smart thermostat supports your equipment, especially heat pump, dual-fuel, multi-stage or communicating systems; wiring changes at the equipment are technician work.
About this definition
Written by the Home Energy Group team — a family-owned HVAC company celebrating 25 years of comfort & care across SW Washington and the Portland metro, licensed in Washington (WA LIC# HOMEEGI003J7) and Oregon (OR CCB# 184255). Definitions inform; an on-site diagnosis decides.
