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How Do I Protect My Home During a Wildfire Smoke Event?

Last updated October 25, 2026

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The short answer

Seal Your Home's Envelope

The first defense is to prevent smoke from entering. Keep all windows, doors, and pet doors tightly closed. Use weather stripping or towels to seal gaps under doors and around window frames. Check for openings where pipes or wires enter walls and seal them with caulk or foam. This step reduces the amount of polluted outdoor air that can infiltrate your home.

Improve Indoor Air Filtration

Your HVAC system can help filter the air if used correctly. Set the system to 'on' or 'recirculate' mode, not 'auto', to continuously filter air. Install a high-efficiency filter to capture fine particles, if your system can use one. Check and replace filters more frequently when smoke is heavy, as they can clog quickly.

For added protection, use a portable air cleaner with a HEPA filter in the room where you spend the most time. Keep the room's doors closed to create a clean zone. Avoid activities that generate indoor air pollution, such as burning candles, frying food, or vacuuming without a HEPA filter. These measures actively remove smoke particles already inside.

  • Set HVAC fan to continuous 'on' mode.
  • Use a high-efficiency filter compatible with your system, such as a MERV 13 filter.
  • Place a portable HEPA air cleaner in a main living space.
  • Avoid using swamp coolers or window units that bring in outside air.
  • Do not use an ozone-generating air purifier, as it can harm your lungs.
  • Change furnace and air cleaner filters often during smoky conditions.

Create a Clean Room

Designate one room as a clean space for when smoke levels are very high. Choose a room with few windows and doors, like a bedroom. Use a portable air cleaner there and seal any gaps around the door with a towel. Keep this room clear of activities that stir up dust, like sweeping or using a regular vacuum.

Prevent Smoke Damage to Belongings

Smoke particles can settle and cause lingering odors and stains. Cover electronics and upholstered furniture with clean sheets or plastic if you expect significant infiltration. Store important papers and sensitive items in sealed plastic containers. If you must go outside, change clothes and wash them separately when you come back inside to avoid bringing particles in.

During the event, avoid using your whole-house fan or attic fan, as they draw in outside air. If smoke has entered, gently wipe down hard surfaces with a damp cloth to remove settled ash, but avoid aggressive cleaning that puts particles back into the air. For valuable items already affected, a qualified restoration professional can assess smoke damage after the event passes.

After the Smoke Clears

Once outdoor air quality improves, you can begin to ventilate your home. Open windows and doors to flush out any residual smoky air. Replace your HVAC filter again and consider having your air ducts inspected if a strong odor persists. Deep clean carpets, upholstery, and all surfaces to remove settled particles that can continue to affect air quality.

If your home sustained water damage from firefighting efforts, act quickly to prevent mold. Remove any standing water and dry out affected areas thoroughly. Moisture left behind can lead to mold growth within days. For significant water intrusion, local water damage pros can perform structural drying and moisture detection.

For lingering smoke odors embedded in walls or furnishings, specialized cleaning by restoration professionals may be needed. They have tools like ozone machines or thermal foggers that can neutralize odors at the source. If you have health concerns from smoke exposure, see a doctor. Check your home insurance policy, as some smoke damage may be covered. Policies vary, and your insurer decides what is covered.

  • Ventilate the home thoroughly with fresh air.
  • Replace HVAC and air cleaner filters.
  • Deep clean all surfaces, fabrics, and carpets.
  • Address any water damage from firefighting immediately to prevent mold.
  • Hire the professionals for persistent odors or stains.
  • Review your insurance policy for potential coverage details.

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Frequently asked questions

Should I run my air conditioner during wildfire smoke?

Yes, but only if you can set it to recirculate indoor air. Close the fresh air intake on your system. Ensure you have a clean, high-efficiency filter installed. Window units that pull air from outside should be turned off, as they will bring smoky air inside.

Can smoke damage my home's structure?

Smoke itself typically does not cause structural damage, but the acidic soot can corrode metals and discolor surfaces. The greater risk is water damage from firefighting, which can weaken materials and lead to mold. If your home was near active firefighting, have a professional inspect for hidden moisture.

What if I smell smoke but can't see it?

Smoke particles are microscopic and can penetrate even sealed homes. The smell indicates their presence. Continue using air filters and keep windows closed. Odors may cling to soft surfaces like curtains and carpets, which may need deep cleaning after the smoke event ends.

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