Thermostat HVAC is an instrument used to measure and regulate the temperature of heating, ventilation, and air conditioning (HVAC) systems. It is designed to maintain comfort conditions within a certain range by controlling the operation of a system’s components such as dampers, fans, valves, pumps, and compressors. The thermostat contains a sensor that detects changes in temperature, and it works to keep the temperature within the desired range. Thermostats are programmed with parameters that determine their operation and how they respond to changing temperatures.