Pneumatic thermostats often hiss when they’re telling your AC or heating system to turn on or off. So, the frequent hissing noises coming from your thermostat are simply the metallic strips adjusting the air pressure inside those tubes.Click to see full answer. Subsequently, one may also ask, why is my thermostat making noise?Thermostat makes a buzzing noise when the heating is turned off at the programmer. If a thermostat makes a buzzing or fizzing noise when switching this is normally as a result of the switch contacts in the thermostat becoming dirty. The noise is the contacts arcing as they close.Secondly, what is a pneumatic thermostat? Pneumatic thermostats are designed to control the air handling system through the use of an air-filled control tube that is capable of sending signals. Understanding how a pneumatic thermostat operate is the first step to getting the most out of one of these types of devices. Additionally, do thermostats make noise? It is normal for the thermostat to make clicking noises. The clicking noises are the relay opening and closing to let the power through to the heating system. While it should be hardly noticeable, it can be reduced by insulating the surrounding of the electrical box in which it is mounted.How do I change a thermostat? How to Install a New Thermostat Turn Off Power to A/C and Furnace. Better to be safe than sorry. Remove Face of Old Thermostat. Take a Picture of the Wires. Disconnect Wires from Old Thermostat. Remove Old Mount. Put on the New Thermostat Mount and Connect Wires. Screw Faceplate Mount to Wall. Attach New Thermostat Face.

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