As wildfires continue to affect California communities with increasing frequency, protecting your home’s air quality is more important than ever. According to recent forecasts, wildfire season is now considered a year-round risk, but the months of June through October remain the most active and hazardous for smoke exposure. Even when fires burn far from Pasadena, smoke can travel long distances and impact air quality across the region.
If you or your family members have asthma, allergies, or other respiratory sensitivities, your HVAC system becomes a vital line of defense. With the right setup and maintenance, it can help reduce the effects of wildfire smoke and improve indoor air quality during periods of heavy pollution.
How Wildfire Smoke Affects Indoor Air
Wildfire smoke contains fine particulate matter (PM2.5)—microscopic particles that can easily enter homes through open windows, door gaps, and even unsealed HVAC ducts.
Once inside, these particles:
- Irritate the eyes, throat, and lungs
- Aggravate asthma or allergy symptoms
- Settle onto surfaces, worsening odor and reducing air quality
Because PM2.5 is so small, standard filters often can’t catch it. That’s why HVAC preparation is key when wildfire risk is high.
HVAC Tips for Smoke Season
Your HVAC system can help reduce smoke-related issues indoors if it’s properly maintained and configured.
1. Upgrade to High-MERV Filters
Use a MERV 13 or higher filter during wildfire season. These filters can capture smaller smoke particles more effectively than standard models. If wildfires are nearby or air quality is poor, replace filters more frequently to maintain airflow and performance.
2. Set the System to Recirculate
Make sure your HVAC fan is set to “recirculate” to prevent smoky outdoor air from being pulled into your home. This setting keeps indoor air moving through the filter without introducing new pollutants.
3. Seal Leaks and Gaps
Smoke can creep in through poorly sealed ducts, attic hatches, and vent connections. Sealing these gaps—especially in older Pasadena homes—helps keep smoky air out. Avoid running exhaust fans during high-smoke days, as they can draw in outside air.
4. Keep the Fan Running Continuously
Running your HVAC fan continuously (with a clean, high-efficiency filter in place) allows air to be filtered all day. This is especially useful if you’re staying indoors due to an air quality alert.
Consider IAQ Upgrades for Wildfire Protection
To add another layer of defense, consider investing in indoor air quality enhancements:
- In-duct HEPA filtration systems
- Electronic air cleaners
- UV germicidal lights or ionizing purifiers
- Whole-home air scrubbers
These systems target not just smoke particles, but also viruses, bacteria, and allergens, making them a smart long-term investment.
Keep Your Pasadena HVAC System Smoke-Ready
As California faces longer and more unpredictable wildfire seasons, preparing your home is no longer optional—it’s necessary. Your HVAC system can help protect your household from the health effects of smoke, but only if it’s tuned up and equipped for the job.
Contact Pioneers Heating & Air today to schedule an inspection, replace filters, or ask about in-home air quality upgrades. We’ll help you stay safe, comfortable, and prepared—no matter what the season brings.
