Bruce Flynnin the last week
Accurate diagnosis, very quick scheduling, and high quality work on our gas line valve replacement.
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Trusted Home Services Since 1932.
Your trusted source for heating, cooling, plumbing, electrical, and solar services in Marin, Napa, and Sonoma counties.
Every service. One team.
Heating, cooling, plumbing, electrical and solar for Marin, Sonoma and Napa since 1932.
Why Choose Ongaro and Sons?
Putting your family name on a business is more than just a label, it’s a promise. It reflects a commitment to integrity, quality, and long-term relationships. For us, that commitment means:
- Knowing your trade.
- Hiring only the best tradespeople.
- Making sure your best tradespeople are continually up-to-speed on the latest technologies and practices.
- Ensuring customer satisfaction with quality service using reliable products backed by guarantees, and providing all of this at reasonable prices.
Value That Lasts
With Ongaro & Sons, you’re investing in quality, integrity, and service that stands the test of time. Explore our current promotions and see the difference real value makes for your HVAC, plumbing, and electrical needs.
Drain Cleaning
Our expert drain cleaning services tackle everything from small clogs to more significant challenges. Trust our team for fast, effective solutions that help prevent future problems.
Career Opportunities
Be a part of an experienced team within an industry in high demand.
Stay in the Know
Sep 17, 2026How Many Amps Does My House Need? Sizing Service for What You Actually Run
How many amps your house needs comes from a load calculation of what you run and plan to add. What drives the number, when existing service is enough, and more.
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Sep 10, 2026Hard Water in Marin County: What Is Actually in Your Water and What It Does
Hard water in Marin County varies by provider and source. The 2025 report figures for Marin Water and NMWD, what hardness does and does not mean, and options.
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Sep 3, 2026Electrical Permit Requirements in California: What Needs One and What Does Not
Find out which electrical projects commonly need permits, how to confirm local exemptions, and what to ask before work begins in Marin, Sonoma or Napa County.
Read More
Our Service Area
- Marin County
- Napa County
- Sonoma County
Since 1932
Why Ongaro & Sons for Your Home
Four trades, one family-owned company, and the licences to prove each of them.
Schedule Service →Four trades genuinely in-house
HVAC, plumbing, electrical and solar are all carried out by our own licensed technicians. A heat pump that turns out to need panel work does not become a second contractor and a second wait.
Eleven active licence classifications
Ongaro & Sons holds C-20 heating and air conditioning, C-36 plumbing and C-10 electrical among eleven classifications on an active California contractors licence first issued in 1963.
Both top HVAC manufacturer tiers
Mitsubishi Diamond Contractor Elite and Trane Comfort Specialist are the highest tier each manufacturer awards.
Independently rated, not self-declared
Diamond Certified since October 2016 through American Ratings Corporation's customer satisfaction research, and BBB Accredited with an A+ rating since December 1995.
The same family since 1932
Four generations, headquartered in Petaluma, working across Marin, Sonoma and Napa Counties. The price is agreed before work starts.
You're in good company
4.8
2,745+ reviews on Google
toni seymourin the last week
They put in new breaker panels for us. Super efficient. Was always kept informed when they'd arrive, how long it would take. Was kind to my barking Chihuahua. Highly recommend.
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Maria Dunain the last week
Brandon, with Ongaro & Sons, came out to our house the day we called to fix our AC unit on a very hot day. He quickly and efficiently determined the issue, plus identify a propane leak. His customer service went above and beyond the call of duty! Will definitely use him in the future.
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Maureen Mcgettiganin the last week
John Lester came to my house very early in the morning. He was business-like and knowledgeable about HVAC systems. But he was also very personable and explained the entire procedure to me. I would highly recommend Ongaro and Sons. His helper Daniel was very good also.
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Susan Krenza week ago
Ongaro was excellent as usual!
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Michael Clarka week ago
They were able to set me up with an appointment right away polite gentleman came out, took care of what was needed cleaned up and left with just a reasonable amount of time to do the work in a reasonable price for it. We will use Ongaro & Sons again. AAAAA+++++*****
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janet benjamina month ago
A big thank you to Cody and Aldo, who quickly came to our condominium to help diagnose the problem, after a PG&E Power outage created a loud noise in our unit. The swift diagnosis and follow up with a quote was greatly appreciated! This is why we will continue to be clients of Ongaro. Thank you, Janet and Ron Benjamin
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Karin Ba month ago
I am always so pleased with Ongaro & Sons. It's a family run business, every tech and manager I have encountered has been so kind, so professional, so friendly, and my dogs always love them! The scheduler always calls me when something opens up before my scheduled appointment. Text communication and post visit write ups are fantastic and full of helpful info. We've used them on three different properties over the last 10-15 years. Our local contractor recommends them and they do great work! We have used them for all manner of things on a modern house, and mid century house and a rental property that was originally built in 1896... HVAC, ductless, ducts, plumbing, furnace, thermostat and recently we bought a new AC from them and it's so quiet, so efficient, and it takes up way less space on our side yard. They are coming next week for our first ever electrical issue and we are feeling very positive about choosing them once again to work on our home.
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Dorothy McComber2 months ago
Cody their electrician was just amazing!!. He even put in the effort to call us saying he'd finished off earlier than expected from his previous client & was in the neighborhood & could come by earlier if we wanted!! Which was fantastic , not only was he able to figure out our wiring he kept us well informed of what he was doing throughout the process. Very knowledgeable & an excellent communicator!!
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