By Jen Marley Bright
Indoor air quality is one of those things we rarely think about until something makes us notice it, whether it's allergy season, a stretch of wildfire smoke, or simply a stuffy home that never feels fresh. For San Jose homeowners, clean indoor air matters year-round, and it's become an especially important consideration given California's wildfire seasons. The good news is that improving your home's air quality is very achievable. Here's how.
Key Takeaways
- High-efficiency HVAC filters (MERV 13 or higher) are one of the most effective ways to clean indoor air
- Air purifiers with HEPA filters help reduce particles, especially during wildfire smoke events
- Reducing indoor pollution sources makes a bigger difference than many homeowners realize
- Sealing your home and managing ventilation strategically protects against outdoor smoke
Upgrade Your HVAC Filtration
Your home's heating and cooling system is your first line of defense for clean air, and the filter you use makes an enormous difference. Many homeowners run basic filters that do little to capture fine particles, when a simple upgrade could dramatically improve the air they breathe.
Getting the Most From Your HVAC System
How to optimize your system for cleaner air:
- Install a MERV 13 or higher filter — California air quality experts recommend a filter with a MERV 13 rating or as high as your system can safely handle, based on the manufacturer's recommendations, to capture fine particles including wildfire smoke
- Run the system on "on" rather than "auto" during smoke events — this ensures air is being filtered constantly rather than only when the system cycles
- Change filters regularly — a dirty filter loses effectiveness and strains your system; during smoky periods you may need to replace filters more often than usual
- Service your system annually — a well-maintained HVAC system runs more efficiently and filters more effectively
Use a Portable Air Purifier
Beyond your HVAC system, a portable air cleaner is one of the most effective tools for improving indoor air quality, particularly in the rooms where you spend the most time. They're especially valuable during wildfire smoke events, which have become a regular part of life in California.
Choosing and Using an Air Purifier
What to look for:
- HEPA filtration — high-efficiency particulate air filters are highly effective at reducing indoor particle levels
- The right size for the room — make sure the purifier is powerful enough for the square footage of the space where you'll use it
- Low or no ozone — choose a model that produces little or no ozone, which is itself a harmful pollutant; the California Air Resources Board maintains a list of certified air cleaners
- A DIY option — in a pinch, you can make a temporary air cleaner by attaching a high-efficiency furnace filter to a box fan, a solution recommended even by the EPA
Reduce Indoor Pollution Sources
One of the most overlooked strategies is simply reducing the pollutants you generate inside your home. Many everyday activities add particles and chemicals to your indoor air without you realizing it.
Common Indoor Pollution Sources to Manage
Where indoor air pollution comes from:
- Cooking — frying and broiling, especially on gas stoves, releases particles; always run your range hood or exhaust fan and consider ventilation when cooking
- Combustion sources — gas and wood-burning stoves, fireplaces, and candles all add pollutants to indoor air
- Household products — aerosol sprays, harsh cleaning products, and some air fresheners introduce chemicals; opt for low-VOC alternatives where you can
- Dust and allergens — regular cleaning helps, though vacuuming can temporarily stir up particles, so a vacuum with a HEPA filter is worth considering
Manage Ventilation and Humidity
Strategic ventilation is a balancing act, especially in California. On normal days, bringing in fresh outdoor air helps dilute indoor pollutants and keeps your home feeling fresh. During wildfire smoke events, though, the priority flips: keep windows and doors closed, seal air leaks with weatherstripping, and set any fresh-air intake to recirculate to keep smoke out. During long smoke events, take advantage of periods when air quality improves, such as after rain or a shift in wind, to air out your home. Managing humidity also matters, since keeping indoor humidity in a healthy range helps prevent mold growth, a common contributor to poor indoor air quality.
FAQs
What is the best way to protect my home's air during wildfire season?
The most effective approach combines several strategies: install a MERV 13 or higher filter in your HVAC system, run a properly sized HEPA air purifier, keep windows and doors closed during smoke events, and seal air leaks. Creating a "clean room" with a good air purifier gives you a space with cleaner air when smoke levels are high, which is especially important for anyone with respiratory conditions.
Do air purifiers really make a difference in indoor air quality?
Yes. A properly sized HEPA air purifier can significantly reduce indoor particle levels, including allergens, dust, and wildfire smoke. The key is choosing one powerful enough for the room, running it continuously on a high setting during poor air quality, and selecting a model that doesn't produce ozone. The California Air Resources Board's certified list is a helpful resource.
How often should I change my HVAC filter in San Jose?
For standard filters, every one to three months is typical, but it depends on your household, whether you have pets, and air conditions. During wildfire smoke events or allergy season, check your filter more frequently, as it can load up with particles faster than usual and lose effectiveness. A clogged filter both cleans less and strains your system.
Thinking About Buying or Selling in San Jose?
A healthy, comfortable home is one of the things buyers value most, and indoor air quality is an increasingly important part of that. Whether you're improving your current home or preparing to buy or sell in the San Jose area, I'm always happy to share what today's buyers are looking for and how to make a home shine.
Reach out to me,
Jen Marley Bright, and let's talk about your real estate goals.
