Village Plumbing & Home Services

The Cleanest Techs in Town

How to Calibrate Your Digital Thermostat

The thermostat is the “genie” that does your will when you’re operating your house’s heating, ventilation, and air conditioning system. It is even better when the system is governed by a digital thermostat, which may or may not be part of a bigger home utility network interface. However, even the digital thermostat can be a bit off in determining the proper temperature settings, and you do not want the utility bill to rise because of bad readings.

Your contractor can teach you about how to take a more active stance in the care of your HVAC system, starting with recalibrating the thermostat.

Unscrew the thermostat’s main housing and look for either a mercury switch, or calibration screw. The mercury switch is a glass vial filled with mercury while the calibration screw is in the middle of a metal assembly. Adjusting both requires different methods.

For a calibration screw, twist it counterclockwise until you see the metal contacts, then you set the system to room temperature. A mercury switch will need adjusting so that its heating element sticks to a metal contact, then close the housing. However, be gentle in doing so to prevent breaking the vial and spilling the toxic liquid on your body.

Digital thermostats are the modern way to control the HVAC system. Learning how to properly calibrate it helps keep the furnace operating at maximum efficiency.


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