When it gets cold outside, your heater becomes your home’s silent hero. But what happens when this hero starts sending signals of distress through unusual burning smells? Understanding these signals is crucial for both your comfort and safety.

There are lots of things we want our heaters to be: efficient, quiet, warm. One characteristic that we don’t want in a furnace is odor. It’s safe to say that smelly things aren’t great, but if your heater smells like burning, it’s time to take a closer look at it. Check out a few of the main causes of this burning odor in furnaces, plus how to get rid of them.

Dust Accumulation

After enjoying a long summer vacation, a heating unit comes back into play as fall and winter settle in. When you go to turn it on for the first time, you may notice a burning smell from the heater. Rest assured, this is perfectly normal.

Dust is a common factor for any piece of equipment that has been sitting around without use. Your heater is no exception. That initial burning dust smell that comes when you flick on your heater for the first time is just the accumulated dust burning off. The smell should disappear after 10 minutes or so. If it lingers, then there may be another cause.

Preventative Maintenance

• Regular Cleaning: Before the heating season begins, clean around your heating unit to remove any accumulated dust.
• Seasonal Inspection: Conduct a basic visual inspection of your heating system before you start using it regularly in colder months.
• Pre-Season Test Run: Briefly run your heater for a short period before the full onset of colder weather to burn off any settled dust in a controlled manner.

Debris in Ducts

Sometimes debris like plastic and rubber can end up in your vents between the seasons—say, a lost toy, for example. If your heater begins to smell like burning plastic, rubber, or other synthetic materials, it’s likely that something is stuck up there that isn’t supposed to be.

The best way to deal with this smell is to isolate the room where the smell is coming from. Then, if you’re able, carefully remove the vent and fish out the debris. If you aren’t able to do this safely, or if you are unable to locate the source of the smell, call your local HVAC expert to come to take a look.

Preventative Maintenance

• Regular Duct Inspection: Check your air ducts periodically, especially before it gets cold, for any signs of debris or blockage.
• Install Protective Covers: During off-season periods, consider covering vents and duct openings to prevent debris from entering.
• Childproofing: If you have small children, make sure vents are childproofed to prevent toys or small objects from being inserted into ducts.

Dirty Air Filter

Spring cleaning works great for your AC unit, but don’t leave out fall cleaning for your heater. Sometimes your heater smells like burning because the furnace filter is dirty. Dust and other organic particles get trapped in filters over time, and when too many have built up, it will cause a stink!

Fortunately, this problem is easy to fix. If your filters are reusable, then it’s time to give them a good scrub with household cleaners. If it’s not, head to the store to find a replacement. Here are some additional tips on how to pick the perfect filter for your heater.

Preventative Maintenance

• Regular Filter Checks: Inspect your air filters monthly and look for signs of clogging or heavy dirt accumulation.
• Scheduled Filter Replacement: Follow a regular schedule for replacing or cleaning your air filters, typically every 3 months, or more frequently in homes with pets or high dust.
• Upgrade Filters: Consider upgrading to higher-quality filters that capture more particles and require less frequent changes.

Damaged Electrical Wires

One of the most pressing reasons a heater smells like burning is electrical problems. Heaters experience general wear and tear over time. Wires can get frayed or out of alignment. If an electrical burning smell is coming from your heater, especially if it lasts more than a few days, it’s probably caused by wire damage.

Electrical issues like these are serious because they can actually start a fire. In these instances, the best way to remedy this is through a heating professional. They will be able to survey your appliance and come up with an action plan. 

Preventative Maintenance

• Annual Professional Inspection: Have a professional HVAC technician inspect your heating system annually, focusing on the condition of wires and electrical components.
• Be Alert to Warning Signs: Pay attention to any unusual sounds or smells from your heater and address them immediately.
• Safe Operation Practices: Ensure your heating system is used according to the manufacturer’s guidelines to reduce wear and tear on electrical components.

The Smell Test

If something isn’t up to snuff with your heating system, we’re here to help. If your heater smells like burning, or if you’re having any other furnace issues, give us a call today! We’re available 24/7 to lend a hand with your heating needs.