Quick Answer
To improve indoor air quality, upgrade to a MERV 11–13 filter your system can handle, change it on schedule, seal leaky ducts, control humidity, and consider a whole-home air purifier. During wildfire smoke, keep windows closed and run your HVAC fan with a high-efficiency filter.
Common air quality problems in Placer County
Homes around Lincoln and the Sacramento Valley face a specific mix of pollutants:
- Wildfire smoke in late summer and fall
- Heavy spring pollen from grasses, oaks and olive trees
- Dust drawn in through leaky attic ductwork
- Stale air in tightly sealed newer homes
Steps you can take today
Start with the basics:
- Use a pleated MERV 11–13 filter if your system supports it, and change it on schedule
- Vacuum with a HEPA vacuum weekly
- Run bathroom and kitchen exhaust fans
- Keep indoor humidity between about 30% and 50%
Wildfire smoke playbook
When smoke rolls in, close windows and doors, set your thermostat fan to ON to keep air moving through the filter, and replace the filter once the smoke event ends. Portable HEPA purifiers help in bedrooms. If your AC pulls in outside air through a fresh-air intake, close it during smoke events.
Whole-home solutions
For allergies, asthma or frequent smoke, whole-home options work through your existing ductwork: media filter cabinets, electronic air cleaners, UV lights that keep the indoor coil clean, and duct sealing to stop dusty attic air from being pulled in. A technician can recommend what your system can support without restricting airflow.
Frequently Asked Questions
Can my HVAC system filter wildfire smoke?
Yes, partly. A MERV 13 filter captures a large share of fine smoke particles if your system can handle it. Run the fan continuously and replace the filter after the event.
Does duct cleaning improve air quality?
It helps when ducts have visible dust buildup, debris, or pest contamination, or after renovation. Sealing leaky ducts often has an even bigger effect.