If you live in colder weather conditions, then you suppose how crucial your furnace is to your family’s comfort, plus how frustrating it can be when something goes wrong, then there isn’t anything more disturbing than turning on your furnace in the Winter time plus experiencing odors coming from it. While some odors coming from your furnace may be a sign of a dire problem, other odors are normal, plus may not be a cause for concern! Here are a few examples of odors that you might encounter coming from your furnace, what they mean, plus what you can do about them. If you odor sulfur or rotten eggs coming from your furnace, you may have a natural gas leak… Natural gas in its raw form is odorless, plus gas companies use additives to alert people of its presence in their homes. If you odor rotten eggs or sulfur coming from your furnace, turn it off right away plus contact your gas supplier. If you odor mold or mildew coming from your furnace, you may have excess moisture in your HVAC duct, during the summer time when you aren’t running your furnace, it is possible for moisture to build up within your HVAC duct, plus when you turn it on, you may odor mildew coming from your furnace. If you are experiencing mildew in your ducts, it may be a great idea to have your HVAC duct cleaned by an Heating as well as A/C supplier. If you odor burning dust coming from your furnace, this is properly not a cause for concern. During the warmer months, dust can build up inside your furnace plus become ignited when you turn your furnace on. This odor is normal, plus should go away within a few minutes.