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Why Does My Furnace Smell?

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Why Does My Furnace Smell?

Posted On: October 31, 2024

Why Does My Furnace Smell?

If your furnace has an unusual smell, it could be caused by a variety of issues. Here’s a breakdown of common furnace smells and what they might mean:


1. Burning Dust Smell

  • Cause: If the furnace hasn’t been used for a while (like at the start of winter), dust will often accumulate on the heating components. When the furnace is turned on, the dust burns off, producing a distinctive smell.
  • Solution: This is usually normal and should go away within a few hours. If it persists, replace or clean the air filter and vacuum around the furnace.

2. Musty or Mildew Smell

  • Cause: Moisture can build up in the ductwork, leading to mold or mildew growth, especially if the furnace hasn’t been used in a while or if there is a humidity problem.
  • Solution: Have a professional inspect and clean your ductwork. Consider using a dehumidifier in your home to control moisture levels.

3. Electrical or Metallic Burning Smell

  • Cause: An electrical or metallic smell can indicate overheating of furnace components, often caused by worn-out parts, faulty wiring, or even a blower motor that is burning out.
  • Solution: Shut off the furnace and call a technician, as electrical issues can be hazardous.

4. Rotten Egg or Sulfur Smell

  • Cause: This smell typically indicates a natural gas leak, as utility companies add a sulfur-like odor to natural gas to make leaks easier to detect.
  • Solution: Turn off the furnace immediately, leave your home, and contact your gas company or emergency services.

5. Oil or Smoky Smell

  • Cause: If you have an oil furnace, a smoky smell could indicate incomplete combustion or an oil leak. It may also happen if the air filter or burner is dirty.
  • Solution: Shut down the furnace and have it inspected, as burning oil or smoke can cause health issues.

6. Chemical Smell

  • Cause: A chemical odor could indicate a cracked heat exchanger, which might allow carbon monoxide to leak into the air.
  • Solution: This is a serious issue. Turn off your furnace, open windows, and have a professional inspect it right away.

Preventive Tips

  • Change air filters regularly (every 1 to 3 months).
  • Schedule an annual furnace tune-up to ensure safe and efficient operation.
  • Check for any obvious blockages or leaks around the unit.

If you’re unsure about the smell or if it persists, calling a professional HVAC technician is the safest option.



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See What Our Customers Are Saying:

by Anna Chin, Ajax on Twintech Heating and Cooling

On one of the coldest days of winter, our furnace stopped working. Our regular furnace company came and told us we had a CO2 leak and shut us off. Their quote for a new furnace was way too high and they couldn't even install it on the same day. TwinTech was recommended to us by a friend. We called and spoke to Dave who was very nice and knowledgeable. Grant showed up a short time later and a new furnace was installed the same day with no troubles at all. Best of all, we received a higher-end furnace than what was offered by our previous company and at a cheaper price. I would recommend TwinTech with no hesitation at all.

by Hiba, Pickering on Twintech Heating and Cooling

I installed a new furnace and Air conditioner with them. The installation is of high quality and according to standards. The guys are professional and reasonably priced.. I highly recommend them.

by Robert, Pickering on Twintech Heating and Cooling

Had new furnace installed and ran into some difficulties but the contractor responded in a timely and efficient manner - after further service calls were made, a reasonable resolution was found.

by Brian Burns, Whitby on Twintech Heating and Cooling

The work was done quickly efficiently neatly and professionally. Pleased with the service, information, product, and the company.

by Geoff, Port Perry on Twintech Heating and Cooling

Great sales member named Dave came in told us some amazing items and how they would be priced installed an all. We couldn’t believe it! The next day the ac was installed, that day one employee named Greg told us that our furnace was working way to hard and was causing us to use way too much gas. So two days later they came in an installed a new furnace!

by MB, Ajax on Twintech Heating and Cooling

Installation was done quickly and professionally. The new furnace is quiet and provides even heat.

by Richard from Oshawa on Twintech Heating and Cooling

They removed and discarded old furnace. Installed new furnace. Installed air intake pipe, that had never been installed by builder, no charge. Replaced loose hose on floor with hard pipe and rerouted it to drain, no charge. Almost 33% cheaper then quote from Enercare, which was the company we dealt with and had insurance with for 8 years. No yearly fee for cleaning/insurance, saves 300 a year. Courteous, professional, fast, and friendly. My wife and I have been recommending them to everyone we know and meet, and will continue to do so. Thanks for everything, Twintech!!!

by Darcy from Pickering on Twintech Heating and Cooling

This company was great to deal with. Our furnace went down and they installed a new furnace the next day with a lot of professionalism!

by gillian hooton from Uxbridge on Twintech Heating and Cooling

Finally! An honest company with highly knowledgeable and informative staff. Had a furnace service and found multiply errors in our system from an amateur installer. Very fair price to correct problems and will definitely use again.

by dflynn in Ajax on Twintech Heating and Cooling

Had to replace the heating & a/c unit in a condo apartment dwelling. this company recommended by the property manager and president of the condo building. found their workmanship and attention to details very good and very thorough. were able to resolve small problems and situations and happy to feel the heat in my unit. it's pricey, but happy was done by a very professional service. thank you.

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See What Our Customers Are Saying:

by Aaron on Twintech Heating and Cooling

We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.

by Linda on Twintech Heating and Cooling

Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!

by Robert Rogers on Twintech Heating and Cooling

Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.

by Robert Mizuno on Twintech Heating and Cooling

We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!

by Ruth on Twintech Heating and Cooling

TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!

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