When summer weather fades away and cooler fall temperatures kiss red leaves, we all follow the ritual of switching our HVAC systems over from “Cool” to “Heat.” At this point, a surprisingly common question that homeowners ask on that first chilly morning is, “Why does my furnace smell when I first turn it on?”
Many odors are harmless, but others present safety concerns that require professional attention. How can you tell which is which?
Leading Causes of Heating System Start-Up Odors
These are the most common reasons your furnace may smell slightly unusual when you first turn it on. Many a (brief) whiff from a furnace at the beginning of the season is normal. Take a look at why you’re smelling something and what to do below.
Dust Accumulation
As your furnace sits dormant for several months, dust builds up inside the system on and around components like burners and the heat exchanger. As soon as you power up the system, the intense heat rapidly burns off this dusty layer, producing a familiar smell.
A momentary smell is of no concern. It should disappear within a few hours. If it lingers, your furnace may need professional cleaning to remove more severe buildup.
Combustion Byproducts and Safety Concerns
Furnaces that burn gas or oil as fuel produce combustion byproducts like carbon dioxide and water vapor. If you detect odors that smell like fuel, it could be an indication of a serious issue with the heat exchanger or exhaust vent.
Persistent smells related to combustion can also signal fuel or exhaust blockages or leaks. This, in turn, presents a severe health risk related to carbon monoxide poisoning. Switch off the unit, ventilate the room well, and call a qualified HVAC expert to address things as quickly as possible.
Electrical Smells
A plastic-like burning odor coming from your furnace can point to overheating or problems with electrical connections.
Electrical odors often indicate fire and other safety hazards. An expert technician should inspect the system immediately.
Maintenance Issues and Prevention
Regular furnace inspections and filter replacements will not only prevent most odors from developing but will also provide extensive efficiency, reliability, and safety benefits.
HVAC system experts recommend that you schedule two system tune-ups and inspections annually in our seasonal climate. Book one before the heating season and another before the cooling season.
Call No Problem Heating & Cooling for Expert HVAC Services
Don’t hesitate to call No Problem Heating & Cooling. We provide comprehensive heating system installations, repairs, and regular maintenance to keep your property safe and comfortable.
Trust our reputation for top-notch customer service and 100% satisfaction guarantee. Call No Problem Heating & Cooling today at (636) 400-3089 to schedule prompt HVAC service.
