You might be the type of person to turn on your heater, whether it be a furnace or a heat pump, at the slightest hint of a chill in the evening air. But what if there’s an odd, funky burning odor coming from the heater when you turn it on for the first time? How can you tell which smells are detrimental to the unit and your building’s occupants and which are mostly harmless? In this article, an HVAC repair expert discusses the different kinds of burning odors that can come from a heating unit.