What That Weird Furnace Smell Actually Means (And When to Take Action)

Fall is just around the corner in Cincinnati, and cooler temperatures means you just might flip your thermostat over to “heat” for the first time in months. When you do, you might notice an odor coming from your furnace. Most of the time, this is common — just a product of turning the heater on for the first time this season.

But sometimes, furnace odors can be a sign that something’s wrong. Here are four furnace smells you might notice in your home and what to do about them.

4 Common Furnace Smells and What They Mean

#1. Burning Dust? Very Normal.

If you smell a “burning” or “smoky” scent when the furnace kicks on for the first time, that’s pretty normal. It’s most likely the smell of dust that has gathered over the off-season and is now burning away. Most HVAC experts agree that the smell of dust burn off is temporary, and usually goes away after the first few hours of turning your furnace on. If the smell lasts longer than a few hours, consider calling a furnace professional to check on the machine, and possibly clean it, so that this doesn’t become a recurring problem.

#2. Burning Plastic or Rubber? Time to Call.

If the scent smells more like burning plastic, rubber, or electrical wiring, it’s probably not dust, and it may be something more serious. A burning plastic smell from your furnace could be a possible sign that:

• Something is wrong with your furnace’s electrical wiring
• Part of your furnace is overheating
• Part of your furnace is failing and may need to be replaced

No matter the source, it’s important to turn the furnace off and call a furnace repair company in the Cincinnati area.  An HVAC repair expert will be able to look at your system and let you know if you need a repair or replacement to continue operating your furnace safely.

#3. Musty or Moldy? Time for a Deep Clean.

If you’re picking up musty or damp smells from your furnace, that’s often a sign of mold or mildew in your ductwork or furnace area. While this isn’t immediately dangerous, breathing that in all winter long isn’t great for comfort, or for allergies. First, replace your air filter and clean the surrounding areas as best you can. Then, consider scheduling an appointment with an HVAC repair specialist in Cincinnati so that your ducts can be professionally cleaned.

#4. Rotten Eggs? Take Action Immediately.

If you notice a sulfur or rotten-egg odor, it may be a sign that your gas furnace is leaking, a potential emergency. To be safe, leave your house immediately and call 911 or your gas company from a safe location. They’ll be able to direct you on the best next steps to ensure your and your family’s safety.

What if I’m Not Sure What the Odor Is?

While some furnace odors are perfectly normal, others can be signs of dangerous safety hazards, including carbon monoxide leaks, fire risks from overheating wires and potential gas explosions. While these events are not the norm, if you’re in doubt, it’s always best to take action.

Switch off your furnace, ventilate (and possibly exit) your home, then call a professional to check on the system and advise you on next steps. The best heating companies in Cincinnati will be able to offer you expert help and support every step of the way.

Preventing Furnace Smells Ahead of Time

While it’s impossible to entirely prevent the occasional furnace owner, there are things every homeowner can do to reduce their likelihood. Some easy maintenance things you can do to keep your furnace running safely and odor free include:

• Replacing your furnace filter regularly, at least every 1 to 3 months.
• Scheduling annual furnace maintenance at least once a year, ideally in the summer/fall before cold weather arrives.
• Scheduling regular professional furnace cleanings in addition maintenance reviews, so that your system stays in good shape.
• Installing carbon monoxide detectors on each floor and testing them regularly, so that you can stay safe and catch a leak ahead of time.

When in Doubt, Call a Professional

At Jansen Heating & Cooling, we care about our customers’ safety, comfort and peace of mind. If you’re experiencing an unknown furnace odor, reach out and schedule an appointment. We can provide an expert assessment of your furnace and ensure everything’s working correctly and safely, so that you can go back to staying warm and enjoying the winter season.