Will a smart thermostat ruin a furnace? Is a smart thermostat safe for your HVAC and furnace equipment? The answer is: it depends. I know how people hate that response, but the fact is that these things can be complicated and there is no easy answer. You have to know your particular set of circumstances to understand if you are ruining your boiler with a smart … [Read more...] about How To Ruin A Furnace: Use The Wrong Smart Thermostat