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It's all solid state, so no clicking. Basically, no moving parts. On a separate note, I was surprised at the range of connection for WiFi. The WiFi router it connects with is over a 100 yards away and through 2 walls!
Sorry, there was a problem. Please try again later.There might be one in your furnace/boiler but that is not something that comes with the thermostat. My old furnace has a very audible click while my new one does not.
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