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Wildfire Season HVAC Guide

Fall Guide for Bay Area Homeowners

Wildfire smoke has become a seasonal reality in the Bay Area. Your HVAC system can be your best defense against hazardous air quality - if you use it correctly. Here's how to breathe easier during fire season.

Upgrade Your Filter

During smoke events, a standard filter isn't enough. Use MERV 13 or higher to capture fine smoke particles. If your system can't handle high-MERV filters, add portable HEPA purifiers.

Run on Recirculate

Set your HVAC to recirculate indoor air rather than bringing in fresh air. Most systems do this by default, but check if you have a fresh air intake.

Keep the House Sealed

Close all windows and doors. Avoid using exhaust fans that pull air out (and smoky air in). Seal obvious gaps with towels if needed.

Add Portable Air Purifiers

HEPA air purifiers provide additional protection. Place in bedrooms and living spaces. Run continuously during smoke events.

Run Your System Continuously

Keep the fan running even without cooling or heating. This continuously filters air through your HVAC system. Use "fan on" mode on your thermostat.

Change Filters Frequently

Smoke clogs filters fast. Check every few days during heavy smoke and replace when dirty. A clogged filter does more harm than good.

Fall Checklist

  • 1Stock up on MERV 13+ filters
  • 2Have portable HEPA purifiers ready
  • 3Know how to set HVAC to recirculate
  • 4Check window and door seals
  • 5Monitor AirNow.gov for air quality
  • 6Plan for filter replacement during events
  • 7Identify a clean air room
  • 8Know cooling center locations

Wildfire Season HVAC Guide FAQs

Find answers to common questions about our services

MERV 13 or higher effectively captures smoke particles. MERV 16+ provides better protection. Check that your system can handle the increased airflow restriction - some older systems can't.
Yes - running your HVAC (in recirculate mode) filters air even if you don't need heating or cooling. Set the fan to "on" rather than "auto" for continuous filtration.
Check every 2-3 days during heavy smoke. Filters may need replacement every 1-2 weeks during extended events versus the usual monthly change.

Related Resources

→Indoor Air Quality Guide→HVAC Maintenance Services→Emergency HVAC Services→Air Purifier Types Comparison→Bay Area Climate Zones

Need Fall HVAC Service?

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