Is it Normal for a New Furnace to Smell?

December 08, 2021

Have you recently had a new furnace put in and are now noticing an unusual 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 ignore.

Why Your New Furnace Smells

There are two explanations why a new furnace might smell.

Protective Finish

Your furnace has a special coating on specific parts to keep them from rusting. This may include the heat exchanger, which safely gets rid of gases such as carbon monoxide naturally created during the heating process.

When your furnace runs for the first couple of times, the coating may emit a burning smell. This is standard and the smell should go away the more your furnace heats.

To be on the safe side, you’ll want to call a heating and cooling company if the smell persists. A burning smell that lingers can mean the motor is too hot or there’s an electrical problem, among other issues.

Dust

Dust accumulates inside your furnace when it’s idle 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 decrease or prevent this smell is by having furnace maintenance done each year. This is required to keep your valuable manufacturer’s warranty valid, plus it keeps your furnace clean and ensures it will run properly 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 odors 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 coated in plastic to protect against shocks, and this smell is an indication that heat is melting this precautionary coating. To avoid a fire, turn off your furnace immediately and have it inspected out by an HVAC technician.
  2. Gas or rotten eggs. Gas companies include sulfur in natural gas to alert you when there’s a problem. If your furnace smells like gas or rotten eggs, shut it off immediately, evacuate 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 advise having your ductwork checked and cleaned if needed.

Now that you are aware which furnace smells are normal and which ones aren’t, you’re ready to take care of your new heating system. If you have concerns about a strange odor, our Scott Temperature HVAC technicians can help. Contact us at 785-269-0465 to schedule your appointment now. We offer quality, affordable furnace repair in Lawrence and surrounding areas.