Burning or Gas Smell in Spokane, WA

Spokane's winters are no joke. When temperatures drop hard - and they do, fast - furnaces that sat idle all summer get pushed back into service. That's when problems surface.

Spokane has seen significant building booms over the past two decades. Neighborhoods from Kendall Yards to the South Perry District to Browne's Addition have a mix of older homes and newer builds. Many homes built 15 or so years ago were fitted with builder-grade furnace units. Those systems are now hitting the end of their designed lifespan - and that's exactly when these symptoms start showing up.

Here are the most common root causes behind furnace odors:

Burning Dust (Usually Harmless - But Worth Watching) When a furnace fires up for the first time each season, it burns off dust that settled on the heat exchanger and burners over the summer. This produces a brief, dusty burning smell that typically clears within 20–30 minutes.

If the smell persists beyond the first heating cycle, or returns regularly, it's no longer just dust. Something else is going on.

Dirty or Clogged Air Filter A severely restricted filter forces your furnace to work harder. The blower motor overheats. The heat exchanger runs hotter than it should. You get a hot, slightly acrid smell - and you're shortening the life of your system with every hour it runs that way.

Overheating Heat Exchanger The heat exchanger is the metal chamber that separates combustion gases from the air you breathe. When airflow is restricted - by a dirty filter, blocked vents, or a failing blower - the heat exchanger overheats and can crack.

A cracked heat exchanger is one of the most serious furnace failures. Combustion byproducts, including carbon monoxide, can leak into your living space. You won't see it. You may not smell it. But it can make your family sick - or worse.

Electrical Burning Smell A sharp, acrid smell - like burning plastic or hot metal - often points to an electrical issue. Possible causes include:

• A failing blower motor with worn bearings
• Overheating capacitors or control boards
• Wiring that has degraded or been damaged by heat or pests

These issues don't fix themselves. They tend to escalate.

Gas Leak (Rotten Egg / Sulfur Smell) As covered above, this is the most urgent scenario. A gas leak can result from a cracked gas valve, a loose fitting at the burner assembly, or a corroded connection in the gas line. None of these are DIY repairs.

Before you call - or while you're waiting for us - here are checks you can safely do as a homeowner:

• Check your air filter. Pull it out and hold it up to a light. If you can't see light through it, it's overdue for replacement. A clogged filter is the single most common cause of furnace overheating.
• Check your vents. Walk through your home and confirm that supply and return air vents are open and not blocked by furniture, rugs, or curtains.
• Listen to the furnace. Does it run a full heating cycle and shut off normally? Or does it short-cycle (start and stop quickly)? Short-cycling with a burning smell is a red flag.
• Check your CO detectors. If you have carbon monoxide detectors, confirm they have working batteries and are not alarming.