The heat in your home is a moving force that will always flow to colder pockets. Warm air from your furnace, boiler, or heat pump escapes through cracks, heading toward cooler areas until there is no longer a temperature difference. In the summer, heat flows directly from the outdoors into your air-conditioned home.
Insulation is a protective barrier to prevent heat from leaving or entering your home. It keeps you comfortable and helps control your climate. Insulation maintains the indoor temperature, reduces outdoor noise levels, and protects your indoor air quality (IAQ) from outside pollutants.
Family-owned and operated, Ongaro & Sons has been helping homeowners in Northern California since 1932. We serve customers in Marin, Sonoma, and Napa counties.
Why Reinsulate?
Your older home might have a lot of charm—but let’s face it, things can get drafty. Prior to 1980, building codes for home insulation were practically nonexistent. Here are a few telltale signs that reinsulation will help:
- Rooms feel hot and stuffy in the summer.
- You feel drafts in some rooms.
- Your HVAC runs nonstop during peak seasons.
- Your allergies flare up inside your home.
Reinsulation adds comfort to your day and saves you money on your heating and cooling bills. Where to start? The most effective places to reinsulate in an existing home are the attic, crawl spaces, basement, and exterior walls. Doing so will add more comfort and lower your energy bills.
Insulation Services in California
A well-insulated home is a money saver. The U.S. Department of Energy (DOE) notes that adding insulation to attics, floors, and crawl spaces can reduce your heating and cooling costs by up to 20 percent.
At the same time, the North American Insulation Manufacturers Association (NAIMA) estimates that approximately 90 percent of U.S. homes are under-insulated. Schedule an appointment with Ongaro & Sons today to learn how adding insulation can help create a healthy home.
Our team at Ongaro & Sons will air seal and insulate your home to ventilate properly, keep out pollutants, and improve your IAQ. We take great care in our craftsmanship and will show you how we plan to proceed beforehand.
We offer comprehensive insulation solutions for every area of your home:
Heat rises—so don’t let it escape through your attic. We offer top-grade blown-in or batt insulation to seal your home’s upper level and prevent energy loss.
Your Comfort, Our Priority
Ongaro & Sons is your trusted heating, cooling, plumbing, electrical, and solar expert—specializing in reliable maintenance and repair services that keep your home running efficiently year-round.
Our certified technicians deliver unmatched expertise with fast, friendly service across Northern California. From HVAC tune-ups to plumbing repairs and electrical upgrades or solar solutions, we focus on energy-efficient performance and long-term comfort. Count on us to maintain the systems that power your home and keep your environment just the way you like it.
PHCC- and NATE-Certified Experts
Our technicians are licensed, experienced, and trained to service all makes and models.
Locally Owned and Operated
Serving the Napa, Marin, and Sonoma communities with personalized, hometown service.
Reliable Repairs
We respond quickly and get the job done right the first time—no surprises.
Types of Insulation
Choosing the right type of insulation is key to maximizing your home’s energy efficiency and comfort. Here are some of the most common insulation materials we offer, each suited to different spaces and performance needs.
Spray foam insulation sets the gold standard. It keeps out the elements (including moisture), creates an airtight seal, and is environmentally friendly. Spray foam sets quickly and is easy to apply. It has an advantage over other forms of insulation because it can fill tight crevices.
Homes insulated with spray foam enjoy better protection against mold and mildew. It also creates a natural sound barrier so you can enjoy your quiet time.
Choosing Insulation for Your Northern California Home
Here are a few factors to consider when choosing insulation:
The R-value indicates how well insulation material can reduce heat flow between the inside and outside of your home. For example, the value R-30 means it takes approximately 30 minutes for the heat to radiate through that insulation. The greater the R-value, the more the heat flow is reduced.
Call Us Today for Insulation Advice!
Our team at Ongaro & Sons can answer all your questions about insulating your home in Penngrove, Larkfield-Wikiup, Corte Madera, or any surrounding area of Northern California. Call us today at 415-741-2820 or request services online.
5%
Member Discount
Ongaro Maintenance Plans
Annual maintenance on your home systems provides safeguards and comfort to you and your family. Neglecting your routine checkups can potentially put everyone at risk.
With these annual visits, our experienced technicians use the latest technology to help find unsafe problems before they can become bigger problems.
Maintenance Plan Benefits
Member benefit of 5% discount on repairs and replacements.
Proactive maintenance identifies and addresses issues before they become big problems.
Courtesy reminder calls for scheduled services and appointments.
Special Offers
Enjoy our seasonal promotions and save on your next service.
Limited-time offers—don’t miss out!
Free MacBook Air
With HVAC Upgrade*
$700 Off
Hydro Jet Sewer Cleaning*
FREE
Camera Inspection*
$69
HVAC System Diagnostic*
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Frequently Asked Questions
Yes—insulation not only improves energy efficiency but also acts as a sound barrier. Adding insulation to interior walls, floors, and ceilings can significantly reduce noise between rooms or from outside sources.