When you run your HVAC system, it circulates air throughout the house, first drawing it in through return air ducts and then sending it back out it the rooms through the supply ducts. During the winter, you’ll run the furnace to heat up this air, and that means the effects of the furnace are felt all around the house. So it makes sense that if the furnace isn’t working right, it can have an effect on your home’s indoor air quality … aside from making it less hot, of course.
Below we’ll look at several ways a malfunctioning furnace can have a negative effect on the air quality in your house.