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I recently switched from Nest to Ecobee and started noticing a two distinctive 'thumps' right before the furnace shuts down. The 'thumps' are approximately 2 mins and 1 min before the furnace shuts down completely.
I have a two story house with a single zone and gas furnace. I do have gas heating and electric AC. Does this have to do w/ staging? Why is it so loud? Does it harm the furnace in anyway? Can it be turned off? I searched for reverse staging and couldn't find the setting in ecobee. Never heard these noises with Nest.