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What Stinks? Common Heating System Odours
Posted On: October 7, 2017
When your heating system at home is working properly, you will not hear any sound... and you will definitely not smell any foul odour. If yours is giving off an unusual odour, don't panic just yet. It's better to know what it is you smell.
Here are some of the most common heating system odours and what they mean:
Rotten Egg
Natural gas is odourless and gas companies add a chemical to it - causing a rotten egg smell. If what you're smelling is a faint odour, observe for a few hours or a day because it may go away quickly. But if the odour is strong, that could mean a gas leak! Quickly open your windows to get proper ventilation. If possible, shut off the heating system and leave your house. You should also call Twintech Heating & Cooling or the fire department in your area to check it.
Burnt or Smoky
If you are catching the odour of burning plastic or wires, it could mean that there's a material inside your system that is overheating. The smell (hopefully, there's no smoke in sight!) could indicate severe overheating is happening. This can start a fire. Shut your system off until the source of the burning smell is located by an HVAC pro.
Dusty
Are you noticing a dusty smell when you turned your heating system on when you got back from your summer trip? See, dust accumulates on your system's components and they can get hot when your system starts running thus causing the smell. The smell will usually be gone within a few cycles.
Electrical
Similar to the smell of burning material, this odour may also be indicative of overheating. It may also mean there is a problem with the motors, wiring, or other electrical components. It may indicate a pending blower motor failure. The system should be immediately shut down and the problem fixed.
Dead Animal
It is not impossible for small animals like mice to reach your heating system or ductwork and die there. It can cause a very foul odour. Of course, this offensive smell would go away as soon as the dead animal is removed and the spot cleaned.
Twintech Heating & Cooling has been providing homes with the solutions you need, including addressing all those odour problems that you might encounter with your heating system. If you are bothered by any of those odours, give us a call!
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See What Our Customers Are Saying:
Aug 8, 2025
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.
Aug 8, 2025
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!
Feb 18, 2025
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.
Feb 18, 2025
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!
Feb 18, 2025
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!
Feb 18, 2025
Amazing experience with TwinTech Heating & Cooling! Their team was professional, knowledgeable, and efficient from start to finish. They installed my new furnace quickly and left everything spotless. The technicians took the time to explain everything and made sure I was comfortable with the system before they left. Great customer service and fair pricing. I highly recommend them for anyone needing HVAC services!
Feb 18, 2025
Great experience all around. Bob was sharp and easy to talk to, and Greg handled the installation perfectly. Would hire them again in a heartbeat.
Aug 17, 2024
I returned from vacation to find my AC unit on the Fritz. After calling way too many places I connected with TwinTech. Ive used the company in the past for my furnace so I was happy when I recognized Greg at my front door. Hes great and the service is always top notch. Id highly recommend using twintech for honest, superior service in the Durham region. Thanks!
Aug 13, 2024
I called Twin Tech when my air conditioning stopped working. Greg came over to diagnose the issue - the same day. He was able to diagnose the issue and resolve it quite quickly. Although it was a quick fix, Greg was very thorough in explaining the issue and provided great advice. Not to mention, I felt very comfortable having Greg in my home - which I consider very important when hiring a service provider. Twin Tech will be my go-to from now on. Thank you!!
Aug 12, 2024
Just hired TwinTech Heating & Cooling to do an A/C Unit removal & reinstall to allow for landscaping access on the side of my house, and they were wonderful!
Bob, Greg & Mitch make a great team! Quick appointment times, super knowledgeable, expert troubleshooting capabilities & very customer service oriented.
I would highly recommend them for all of your HVAC needs! Great job guys!!
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