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Although we often think air pollution as being outside the home, indoor air is commonly two to five times more contaminated than outdoor air, according to the Environmental Protection Agency (EPA). Kevel Home Performance is dedicated to making Bay Area homes healthier and more comfortable. Indoor air quality is often a missing ingredient for healthy home.

Indoor air quality is very important in promoting occupant health because air quality issues often encourage many common health ailments. 


  • Fewer asthma and allergy triggers by reducing pollen, dust, pet dander, fumes, and mold levels in the home
  • Avoids unpleasant odors in the home
  • Prevents moisture issues for healthier, more durable homes
  • Promotes overall occupant health and wellbeing


Some common household allergens thrive when home humidity levels are too high. High mold and mildew counts can trigger reactions in many people, including sneezing, rashes, dizziness, red eyes, and even asthma. Dust mite droppings are a common allergy trigger and dust mites thrive in moist environments.

The air quality in your basement, crawlspace or garage impacts the indoor air quality inside the rest of your home. Much of the air you breath on the first floor originates from below. Because warmer air is more buoyant than cooler air, warmer air can rise up through your crawlspace and into the living spaces, lowering home air quality. This is especially common in the winter during the heating season.

Many San Francisco-area basements and crawlspace have moisture and humidity problems. Kevel Home Performance provides a variety of performance services that boost home durability and indoor air quality. To solve humidity issues, we install sump pumps and vapor barriers. We can also air seal your crawl space to prevent air leaks and install foam insulation.


Air can carry contaminants as it travels through your home. When California homes are poorly ventilated, pollution is trapped inside. Ventilation is an important strategy to dilute pollutants, reducing your exposure.

Kevel Home Performance installs heat recovery ventilation systems, whole-house fans, bathroom exhaust fans, and timers. These systems all help remove odors, moisture, and stale air out from the home. Heat recovery ventilation systems also capture heat that would otherwise be wasted to the outside, lowering your winter energy bills.


For more than 50 years, Aprilaire has been improving indoor air quality as a trusted name in the industry. These whole-house air purifiers, humidifiers, dehumidifiers, and ventilation systems promote home air quality and the products work with all brands of heating and air conditioning equipment. Even when space is limited, we can seamlessly integrate an Aprilaire system into your home, delivering fresh air with your existing ductwork.

Ready for a more comfortable and efficient home? Get in touch today!


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Our Customers Speak for Us

  • Very professional and knowledgeable, excellent customer service. With a new baby, improving the indoor air quality and thermal comfort of our home was a priority - Kevel delivered with great work completed in a timely manner and on budget.

  • My house was very drafty with no working heat before Kevel came. Now, our formerly broken central heating is working great, and I notice a significant decrease in drafts throughout. I would say that Kevel is very responsive and responsible.

  • Excellent workmanship and attention to detail--as well as to our questions. The understanding of the whole house energy system was exceptional, and the "as-built" system diagrams were a real plus.

  • Very professional, knowledgeable, pleasant to work with. They found several major problems with our ductwork that have been around for at least 30 years. Noticing a difference already in how the house seems better able to maintain a constant temperature.

  • Great workmanship and completed in a timely manner by conscientious people. My home temperature is uniform throughout, before the upgrade the downstairs was always a lot colder.

  • Everyone was very friendly, considerate about tracking dirt into the house, kept worksite neat - not to mention did a great job. Brian even came one evening to fix the furnace door which came unlatched so that I could have heat.

  • I am very happy with the efficiency, the fit, the look, and the partial sound reduction. Indow Windows are a very good product with obvious benefits. Kevel provided very knowledgeable and professional service.

  • Feels like a whole different house. No longer do I wake up feeling like I'm camping (i.e. with chilly air feeling like I'm outside). The air sealing I think made the most difference - much more than I had expected.