Is it Normal for a New Furnace to Smell?

December 08, 2021

Have you recently had a new furnace put in and are now experiencing a weird smell? You're not alone, because many other homeowners also have this happen at first. Let’s review what’s creating this smell, and when you can expect it to disappear, as well as three other furnace smells you shouldn’t disregard.

Why Your New Furnace Smells

There are two reasons why a new furnace might smell.

Protective Finish

Your furnace has a special finish on certain parts to keep them from rusting. This may include the heat exchanger, which safely exhausts gases like carbon monoxide naturally produced during the heating process.

When your furnace runs for the first couple of times, the coating may give off a burning smell. This is normal and the smell should dissipate the more your furnace runs.

To be on the safe side, you’ll want to contact a heating and cooling company if the smell continues. A burning smell that sticks around can mean the motor has overheated or there’s an electrical problem, among other issues.

Dust

Dust collects inside your furnace when it’s not running in warm weather. That dust will burn off when you turn on your furnace in the fall, producing a burning smell. This smell should disappear within a few minutes.

One way you can lessen or prevent this smell is by having furnace maintenance done every year. This is necessary to keep your valuable manufacturer’s warranty valid, plus it keeps your furnace clean and ensures it will run smoothly during the upcoming heating season.

3 Other Furnace Smells You Shouldn’t Disregard

While it’s less common for a new system to need furnace repair, it can happen. Here are three other smells you should look out for and what they might mean.

  1. Burning plastic or rubber. If your furnace smells like burning plastic, you might have an electrical problem. Electrical wiring is covered in plastic to prevent shocks, and this smell is a sign that heat is melting this protective coating. To prevent a fire, shut off your furnace immediately and have it inspected out by an HVAC technician.
  2. Gas or rotten eggs. Gas companies add sulfur to natural gas to warn you when there’s a problem. If your furnace smells like gas or rotten eggs, shut it off immediately, leave your home and call 911. Exposure to natural gas can make you ill, plus it’s extremely flammable and explosive.
  3. Musty. If your furnace smells musty, you might have mold and mildew growing in your ductwork. We recommend having your ductwork inspected and cleaned if needed.

Now that you are aware which furnace smells are normal and which ones aren’t, you’re well-equipped to take care of your new furnace. If you have concerns about an odd odor, our Assured Appliance and Heating & Air HVAC technicians can help. Contact us at 847-306-8990 to schedule your appointment today. We provide quality, affordable furnace repair in Genoa and surrounding areas.