HVAC and furnace systems contribute a significant amount to the comfort of modern homes, businesses, and other indoor spaces. When properly installed and correctly maintained, modern HVAC and furnace systems provide warmth and improve indoor air quality with no strange sounds, unexpected expenses, or unfamiliar odors.
Whether you’re new to furnace ownership or have the experience, you may be unfamiliar with some of the signals that your furnace needs maintenance or repair. Among other signs, if your furnace or heater smells like burning, it’s worth taking a closer look.
While you should always speak to an HVAC professional about any furnace issues, being aware of a few key causes of burning smells can help you make the right decisions quickly. Being prepared can save property owners time, money, and stress.
In this blog, we talk about some of the most common causes for a burning odor coming from your furnace, as well as some actions you can take if you encounter them. For more targeted answers to your furnace questions, repair estimates, and more, reach out for Glastonbury heating repair service by SM Mechanical.
Burning Furnace Smell: Causes and Solutions
Below you’ll find the most common reasons why you might be getting a burning smell from your heater. If the burning smell is accompanied by smoke, immediately turn off the power to your furnace or HVAC if possible, move to a safe location, and contact emergency services.
#1: Dusty Furnace
One of the most common causes for a light burning odor coming from a furnace or HVAC system is dust. Over time and during off-seasons, dust and other airborne particles build up on the exposed surfaces of a furnace. If you’ve just turned your furnace on after a long period of not using it, this is the most likely culprit for any burning smells you may detect.
What to Do:
The best clue that dust is causing the smell your heater emits is the dust itself. Visually inspect your furnace without touching it to check for dust or debris buildup on the surface.
If you notice significant dust buildup and your heater smells like burning, your furnace needs cleaning. We recommend contacting an HVAC professional to ensure optimal furnace operation and protect it from potential part damage. These experts have the training and experience to clean your furnace safely and check your whole system for any other undetected issues. As part of regular upkeep, professional HVAC cleaning services protect property investments, reduce safety hazards, and maintain overall indoor air quality.
Trapped Debris
In busy homes or businesses, items sometimes become lodged within the HVAC system, either in the unit itself or within the ductwork that connects to it. When hot air passes through the system, these objects or debris heat up, causing burning smells in one or more locations throughout the property.
What to Do:
If the burning smell is located only in one room, visually inspect any ductwork to check for apparent objects of any kind. Even if you see no debris, the items may be further along in the ductwork.
To protect your HVAC system and limit ductwork damage or damage to your furnace itself, reach out to an HVAC professional as soon as possible. We also recommend avoiding operating your furnace or HVAC unit until professionals remove the debris.
Clogged Filter
Another common reason some furnaces emit burning smells is a clogged filter. Many property owners forget that these filters need changing at specific intervals and operate their furnaces with dusty or completely clogged filters. Not only does a clogged filter reduce the air quality within the space, but it also increases energy costs and poses safety hazards.
What to Do:
The quickest solution is purchasing and installing a new, clean air filter. Make sure to check your HVAC or furnace unit’s requirements to ensure you get the correct type of air filter that is the appropriate size.
As always, to ensure a job well done, you can rely on experienced HVAC professionals to replace your air filter as part of regular HVAC and furnace upkeep.
Damaged Electrical Wiring
Less common than other causes, sometimes damaged electrical wiring or other components are responsible for burning furnace smells. Over time, wiring coatings may break down, or component casings may become damaged from heat, infestations, or other issues. If your furnace has damaged electrical components, such as wiring or an overheated blower motor, you may smell a plastic smell or an ozone smell, in addition to burning.
What to Do:
If you suspect electrical damage as a reason for your furnace’s burning smell, immediately turn off power to the unit by flipping the appropriate breaker. Do not attempt to repair electrical damage on your own. An experienced HVAC technician can diagnose electrical damage and any underlying causes, saving property owners money, reducing stress, and eliminating safety hazards.
How to Tell Your Furnace Needs Repair
While burning smells are a common indicator that your furnace might need repair, there are other signs to watch out for. Talk to an HVAC specialist near you if you notice any of the following symptoms coming from your furnace or HVAC unit:
- Rattling or knocking noises
- No air movement
- No hot or cold air
- Furnace stopping and starting
- Furnace not turning off
- Furnace not heating to correct temperature
Always trust experts to handle your furnace and HVAC inspections and repairs. Doing so prevents failed DIY jobs, improper fixes, and other safety hazards.
How to Avoid Furnace Burning Smells
The best solution for odd furnace smells and other problems is to cut them off before they start. As with any critical home or commercial appliance, regular maintenance and inspections help detect and prevent costly damage or other problems. Have your HVAC units inspected annually and again before resuming use after a long time of no use.
Find an HVAC Technician Near You
Even well-maintained furnaces and HVAC units sometimes experience issues. If your heater smells like burning, calling an HVAC repair expert can save you time, money, and stress. Call SM Mechanical LLC today for an estimate, answers to your questions, tips on heating bill savings, and more.