Why is my thermostat making a buzzing noise?

A buzzing thermostat is something you'll want to resolve right away. If your thermostat is making a buzzing noise, there may be a loose connection in the wiring. It's also possible the bimetallic strip or the cycling contacts on the inside of your thermostat are dirty or worn out. If this is the case, you'll want to have your thermostat replaced to ensure the stable and safe operation of your home's HVAC system.