How do I test my thermostat in my house?

Testing your residential wall thermostat to ensure it is functioning correctly involves performing basic operational checks and accuracy comparisons. First, check the display screen to confirm it has power and fresh batteries if applicable. Second, adjust the temperature setpoint five degrees below the current room temperature for cooling or five degrees above for heating, and listen closely for an audible click from the unit followed by the HVAC system engaging within a minute or two. Third, test temperature accuracy by placing a reliable independent digital room thermometer right beside the wall unit for fifteen minutes; if the thermostat reading differs by more than two degrees, it requires calibration or replacement. You can troubleshoot wiring if equipment fails to respond. You can verify that your thermostat is fully healthy when changing setpoints successfully triggers your heating and cooling cycles.