Phyllis Doeringin the last week
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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North Bay Heater Maintenance
Get Your Furnace Winter-Ready for Just $79.
A furnace tune-up before heating season is the cheapest way to lower your energy bills, prevent a mid-winter breakdown, and add years to your system. Start with a $79 furnace tune-up, or join a plan and save all year.
$79 Furnace Tune-Up
Flat-rate pricing. Limitations and restrictions may apply.
4.8/5 from 2,700+ ReviewsDiamond Certified, Top 3% in CACertified TechniciansServing Northern CA Since 1932
Why Maintain?
Why Regular Maintenance Pays Off
A tune-up costs a fraction of a repair or a replacement. Ongaro & Sons has been performing routine maintenance since 1932, because a well-kept system runs longer and costs less.
Lower Energy Bills
A clean, tuned system doesn’t have to work as hard to heat or cool your home. That efficiency shows up on your monthly utility bill.
Fewer Breakdowns
Most failures start as small, catchable issues. Routine maintenance finds them early, so you’re not left without heat or cooling when you need it most.
Longer Equipment Life
The harder a neglected system works, the sooner it wears out. Annual service helps your equipment reach its full lifespan instead of an early replacement.
Keeps Your Warranty Valid
Many manufacturer warranties require proof of annual maintenance. Staying on schedule protects the coverage you already paid for.
Safety & Peace of Mind
Our technicians check the parts that matter for safe operation, so small problems get caught before they become disasters.
Priority Member Service
Join a maintenance plan and you get priority scheduling plus a 5% member discount on repairs and replacements. Comfort, handled.
Included in Your Visit
What's in Your Furnace Tune-Up
Your $79 furnace tune-up is a full multi-point inspection and adjustment by a certified technician. Here’s what we do.
- Clean and adjust the burner assembly and ignition system
- Inspect the heat exchanger and monitor flue draft
- Test starting capabilities, thermostat, and safety controls
- Measure temperature rise, airflow, and motor performance (volt/amp)
- Tighten electrical connections and check capacitors
- Clean or replace standard air filters (specialty filters at an added fee)
Ongaro Maintenance Plans
Become a Member, Save All Year
A maintenance plan bundles your annual tune-ups with member perks like priority scheduling and a 5% discount on repairs. Pick the plan that fits your home.
Most PopularSave up to $190
Total Comfort Plan
Heating & Cooling + Electrical
All-in-one HVAC, plumbing & electrical care
- ✓Clean and adjust burner assembly.
- ✓Check ignition assembly and heat exchanger.
- ✓Monitor flue draft for proper ventilation.
- ✓Test starting capabilities and thermostat functionality.
- ✓Measure temperature rise and ensure correct airflow.
Save up to $100
Heating Plus Plan
Heating & Cooling
Keep your heating system safe & efficient
- ✓Clean and adjust burner assembly and ignition system
- ✓Inspect heat exchanger and monitor flue draft
- ✓Test starting capabilities, thermostat, and safety controls
- ✓Measure temperature rise, airflow, and motor performance (volt/amp)
- ✓Tighten electrical connections and check capacitors
Save up to $140
Cooling Plus Plan
Heating & Cooling
Beat the heat with seasonal AC care
- ✓Test starting capabilities, thermostat, and safety controls
- ✓Measure airflow, temperature difference, and compressor amp draw
- ✓Monitor refrigerant pressure and check superheat/subcool levels
- ✓Inspect electrical connections, capacitors, evaporator coil (if accessible), and condensate drains
- ✓Clean condenser coil and replace standard air filters (specialty filters incur additional fees)
Also available:Electrical Plus PlanHydronic Comfort PlanTank Water Heater PlanTankless Water Heater Plan
5% Member Discount
On all repairs and replacements.
Annual Savings
Lower bills and fewer costly repairs.
Priority Scheduling
Members go to the front of the line.
Financing Options
Flexible ways to pay for comfort.
Courtesy Reminders
We call when your service is due.
Transferable Plans
Adds value if you sell your home.
How a Tune-Up Works
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Book Your Tune-Up
Call us, or book online in under 60 seconds. We’ll confirm an appointment window that works for your schedule.
Rated 5 out of 5 stars“The staff coordinating the appt was just so wonderful in helping us during a stressful time where our system gave out.”
Ellen L., Santa Rosa - 2
Multi-Point Inspection
Our certified technician cleans, adjusts, and tests your system top to bottom, catching small issues before they become big ones.
Rated 5 out of 5 stars“Very knowledgeable and quick to diagnose the issue. We’ll be calling Ongaro for our needs.”
Bill S., Novato - 3
Clear Findings, Honest Advice
You get a straightforward rundown of how your system is doing. If something needs attention, we’ll tell you, with no pressure.
Rated 5 out of 5 stars“The bid was very competitive compared to the other estimates I solicited.”
Spike M., Petaluma - 4
Stay Ahead With a Plan
Join a maintenance plan and we’ll remind you when service is due, so your system stays covered year after year without you having to track it.
Rated 5 out of 5 stars“He even followed up a few days later to confirm everything was working properly.”
Tim H., San Rafael
Our Promise to You
Flat-Rate Pricing. Honest Recommendations.
Flat-Rate $79 Tune-Up
Your furnace tune-up is a flat $79. You know the price before we start, with no hourly surprises to walk in the door.
No Pressure, No Upsell
A tune-up is a tune-up. If we find something that needs attention, we’ll show you plainly and let you decide. We don’t invent repairs.
Trusted Since 1932
Ongaro & Sons has maintained North Bay systems for over 90 years. Our work is backed by a reputation of 4.8 stars from 2,700+ reviews.
Get Started
Book Your $79 Furnace Tune-up.
No upsell, no hourly clock.
A furnace tune-up is the cheapest insurance you can buy for your heating system. Our certified technician cleans, adjusts, and tests everything that matters, so you head into the cold season with confidence. Call us, or book online in under 60 seconds.
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The quote is the price
A full multi-point furnace tune-up by a certified technician, at a flat-rate $79, no hourly surprises.
- 02
Four generations of local service
Serving Marin, Sonoma and Napa since 1932.
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4.8 stars from 2,700+ reviews
Diamond Certified, top 3% in CA.
$79
Furnace Tune-Up
flat fee, agreed up front
- Multi-point furnace inspection & cleaning
- Safety, thermostat & airflow checks
- Filter clean or replace (standard size)
- Honest heads-up on anything worth watching
Prefer to talk it through first? 415-741-2820
$79 Furnace Tune-Up covers one standard residential furnace. Specialty filters and repairs quoted separately. Limitations and restrictions may apply.
You're in good company
4.8
2,756+ reviews on Google
Charles Earthmanin the last week
We were very satisfied. The electricians were thorough and completed the Job on time. I would recommend Ongaro & sons for electrical projects any time.
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Garth Bixlerin the last week
David was thorough, professional, neat, and very friendly. Great work! Thanks
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Markin the last week
So professional and knowledgeable. We so appreciate Reid’s expertise!
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Maureen Mcgettigan2 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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Karin B2 months 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!!
Read on Google →Furnace Maintenance FAQs
How often should I have my HVAC serviced?
Once a year for each system is the standard: a furnace tune-up heading into the cold season and an AC tune-up before summer. Regular service keeps your equipment efficient, catches small issues early, and helps it last longer.
What’s included in the $79 furnace tune-up?
A full multi-point inspection and adjustment: we clean and adjust the burner and ignition system, inspect the heat exchanger, monitor flue draft, test the thermostat and safety controls, measure temperature rise and airflow, tighten electrical connections, check capacitors, and clean or replace a standard air filter.
What is the Ongaro Maintenance Plan?
It’s a membership that bundles your annual tune-ups with member perks: a 5% discount on all repairs and replacements, priority service scheduling, courtesy reminders when service is due, and plans that transfer if you sell your home. There are plans for heating, cooling, both, and more.
Does one plan cover both heating and cooling?
Yes. The Total Comfort Plan covers both your furnace and your AC in a single membership. If you only need one, the Heating Plus and Cooling Plus plans cover each system on its own.
Will maintenance keep my manufacturer warranty valid?
In many cases, yes. Manufacturers often require documented annual maintenance to keep the warranty in force. Staying on a plan gives you a record of that service, so you protect coverage you already paid for.
Do plan members get discounts on repairs?
Yes. Every Ongaro Maintenance Plan includes a 5% discount on all repairs and replacements, plus priority scheduling so members get seen first when something comes up.
Areas We Serve
Furnace Maintenance Across Marin, Sonoma & Napa
PetalumaSanta RosaNovatoSan RafaelRohnert ParkNapaSonomaMill ValleySan AnselmoCorte MaderaLarkspurTiburonSausalitoCotatiWindsorHealdsburgSebastopolAmerican CanyonSt. HelenaCloverdaleGeyserville
Serving the North Bay since 1932. Don’t see your city? Give us a call. We likely cover your area too.
Request Your $79 Furnace Tune-Up
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A Little Maintenance Saves a Lot.
Skip the surprise breakdown and the sky-high energy bill. Book your $79 furnace tune-up today, or ask about a plan and save all year.