Wildfire Smoke and Your HVAC System
Some summers, smoke from wildfires drifts into the Fraser Valley. Your heating and cooling system can help keep indoor air cleaner.
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Keep windows and doors closed when smoke is heavy.
Run the fan
Running the system fan moves air through the filter.
Better filters
Higher-rated filters catch fine smoke particles, if your system can handle them.
HRVs
Ask your contractor whether to adjust an HRV or ERV during heavy smoke.
Portable cleaners
A portable air cleaner in bedrooms adds extra protection.
Replace filters after
Filters load up quickly during smoke events. Change them afterward.
Outdoor units
Ash can settle on outdoor coils. Rinse gently once the smoke clears, with power off.
Health
People with asthma or heart and lung conditions should follow public health advice.
Plan ahead
Keep spare filters on hand before summer.
Next
See indoor air quality.
After the season
Book a check if the system ran hard through a smoky summer.
Don't overload the blower
A very thick filter can restrict airflow on some systems, making the furnace or AC work harder. A technician can tell you the best filter your system can handle.
Bedrooms first
If you can only clean the air in one area, make it the bedrooms, where people spend the most hours.
Before the season
A spring check and a fresh filter mean the system is ready when the first smoky day arrives.
Smell inside
If smoke smell lingers indoors after the air clears outside, change filters again and air the house out on a clear day.
Pets
Pets with breathing problems benefit from the cleaner air in a closed, filtered home too. Keep them indoors on the smokiest days.
More heating and cooling guides
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