Jim Longin the last week
Ongaro is incredible. They've done many projects for us, and have always gone above and beyond expectations. Not cheap, but always excellent work!
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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
2,760+ reviews on Google
Tracey Bin the last week
5 stars for expertise, professionalism, attention to detail, and more!!! We recently replaced two HVAC systems, both A/C and heat. Everyone we dealt with was exceptional. The technician who came to quote the job was very thorough in his analysis of our home and our needs. He was extremely knowledgeable and helpful in answering all of my husband’s questions. Based on their discussions, he provided us with three different and very detailed quotes. Once we decided how to proceed, a representative came out a few days before the project was scheduled to begin. He spent several hours at our house reviewing everything and making detailed plans. He went over everything with us, explaining what we could expect to take place during the two to three day process. Removal of the old systems and installation of the new ones was handled with care and patience. Everything was thoroughly tested at the end. Highly recommended!!
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Catherine Birdsallin the last week
Roger Hunter was wonderful! He quickly and efficiently carried out everything that needed to be done, and was a real pleasure to have in our home!
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Linda Abraham-Silverin the last week
Thank you Cody Cox for great service for my 89 year old father!
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Phyllis Doeringa week ago
Kurt was a highly motivated installer. There was great communication. He was organized and didn't leave any mess after the installation. Thank you, Kurt!
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Maureen Mcgettigan3 weeks ago
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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janet benjamin2 months 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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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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