AC Repair in Santa Rosa
Ongaro & Sons is the air conditioning company Santa Rosa homeowners call when the cooling quits on a hundred-degree afternoon. We have worked in the North Bay since 1932, we are Diamond Certified, we hold a C-20 HVAC license, and we carry 2,726 Google reviews averaging 4.8 stars. We diagnose the whole system, show you the fault, and give you the price before any work begins.
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Why air conditioning in Santa Rosa is a different machine
Most of what gets written about AC repair is written for a climate where air conditioning is a comfort accessory. Santa Rosa is not that climate. Inland Sonoma County runs into triple-digit afternoons through the summer, and at those temperatures a residential system stops being an appliance that cycles on and off and becomes equipment under sustained load, running for eight and ten hours at a stretch against a heat load it was sized to just barely handle.
That changes the failure pattern in a way that surprises people. Santa Rosa systems rarely decline gently over a season. They run fine in June, and then the first serious heat wave arrives and finds whatever component was already marginal. A capacitor that was drifting out of tolerance, a condenser fan bearing that was noisy but turning, a charge that was slightly low: all of them survive mild weather and none of them survive a week of hundred-degree afternoons. This is why the county's HVAC calendars fill within days of the first extreme stretch, and why a fault you noticed in May is a scheduled appointment while the same fault noticed in August is a wait.
It also changes what a diagnosis has to cover. A system at full load will show you a symptom that has nothing to do with the actual fault. Head pressure climbs because the outdoor coil is packed with dust, the compressor draws more current than it should, the breaker trips, and the homeowner reports an electrical problem. The electrical event is real and the electrical part is not what broke. Diagnosing at load, in the conditions the system actually fails in, is the difference between a repair and a parts hunt.
Ducted central systems dominate here, which is worth saying plainly because it separates Santa Rosa from most of the rest of what we serve. Petaluma's Victorian core and the Eichler belt in Marin push a lot of homes toward ductless equipment. Santa Rosa mostly did not go that way. So a much larger share of Santa Rosa no-cooling calls are delivery problems rather than production problems: leaking ducts in a hot attic, a failing blower, static pressure the system was never designed to fight. The condenser everyone assumes is at fault is often working fine and being asked to do something the duct system cannot deliver.
Two equipment ages in one city
There is no other market we serve where the age of the equipment splits this sharply along neighborhood lines.
Coffey Park, Fountaingrove, and the other areas rebuilt after the 2017 Tubbs Fire carry systems less than a decade old. A great deal of that equipment is high-efficiency, a meaningful share of it is all-electric, and plenty of it is heat pump rather than a conventional split system with a gas furnace. When one of those homes loses cooling, the conversation is almost always a repair conversation. The equipment has service life left, parts are current, and the refrigerant is a current refrigerant. What those homes need is a technician who knows inverter-driven and variable-capacity systems well enough not to treat them like a single-stage condenser from 2004.
Older east- and west-side Santa Rosa neighborhoods are the other case entirely. Systems installed in the 1990s and 2000s are still running there, some of them well past the point where a manufacturer would call them serviceable, and a share of them are still charged with R-22. On those systems the same failure that is a routine repair in a rebuild home becomes a decision about whether to keep spending on the system at all.
Santa Rosa lived through the 2017 Tubbs Fire and the 2019 Kincade Fire, and PG&E Public Safety Power Shutoffs remain a regular reality in the hills. That belongs in the conversation whenever a Santa Rosa homeowner is weighing an all-electric replacement, because cooling equipment only cools while the power is on. It is one of the reasons backup power comes up on HVAC projects here more than it does closer to the coast.
Reading the symptoms, in order of what they cost you to ignore
Not every AC symptom deserves the same reaction. Some of them get worse by the hour, some get worse by the season, and a few are just information.
- Ice on the refrigerant lines or the indoor coil. Running an iced system risks liquid refrigerant reaching the compressor, which turns a modest repair into an expensive one. Turn the system to fan only and let it thaw.
- Burning smell, or a breaker that trips when the outdoor unit starts. Either points at an electrical fault under load, and repeat trips are not a nuisance to be reset around.
- Grinding from the outdoor unit. That is usually a motor bearing, and a fan motor that seizes while the compressor keeps running builds head pressure fast.
- Water pooling near the indoor air handler. Almost always a blocked condensate drain. Santa Rosa's dusty inland summers clog those lines faster than coastal ones, and the damage moves into drywall and framing while you wait.
- Warm air from the vents while the thermostat is set to cool. Refrigerant loss, a failed compressor, or a condenser that is not running while the indoor blower is.
- Short-cycling. The system starts, runs a few minutes, and shuts down without finishing a cooling cycle. Causes range from a failing capacitor to low charge to an oversized system, and short-cycling wears compressors out.
- A hard start that dims the lights. A compressor pulling too much locked-rotor current, often with a failing start component behind it.
- A summer electric bill that jumps with no change in how you use the house. Efficiency loss from low charge, a fouled coil, or a struggling component shows up on the bill before it shows up as discomfort.
- The house never quite reaches the setting on the hottest afternoons. On a hundred-degree day this can be a correctly sized system simply at its design limit. What matters is whether the indoor temperature holds steady or climbs. Holding steady points at sizing or duct capacity. Climbing points at a failure.
- One or two rooms that never cool as well as the rest. That is usually distribution, not the condenser, and no amount of repair to the outdoor unit fixes it.
- Longer run times than last year. The system telling you something while it is still small.
I had a 7 year old AC system that was having issues and the company that put it in would only come out for a very high charge, so I took advantage of the very cost-effective coupon that is offered here 4 AC check out in service.
Tony M.
What the heat breaks, and in what order
Sustained load does not attack a system randomly. It works from the outside in, and knowing the sequence tells you a lot about where you are in the life of the equipment.
It starts at the condenser coil, because that is where the system rejects heat and where Santa Rosa's summer dust and cottonwood load ends up. A fouled coil does not fail so much as it raises the operating temperature of everything behind it. Efficiency drops first, then head pressure climbs, and the components downstream start living outside the conditions they were rated for.
Next come the capacitors and contactors, and these are the most common failures we see in this city. Capacitors carry a temperature rating, and sustained triple-digit days age them faster than a spec sheet assumes. A hum from the outdoor unit with the fan not turning is close to a signature for a failed run capacitor. This is generally a same-visit repair and the least involved real fix in air conditioning.
Then the condenser fan motor, which is the component keeping the coil doing its job. When the fan fails in Santa Rosa heat, the system loses its ability to reject heat entirely, head pressure spikes, and the compressor is next if the system keeps being asked to run.
Refrigerant leaks sit alongside all of this rather than in sequence. Refrigerant is not consumed. If a system is low, it has a leak, and topping it off without locating the leak sells you the same repair next summer. Vibration, formicary corrosion in evaporator coils, and decades of thermal cycling all produce them.
The compressor is where the money is. A compressor failure on a system past ten years, or on R-22, usually means the economics have moved to replacement, and that is a conversation to have with real numbers in front of you rather than a repair to reflexively authorize.
Running through all of it is airflow: the blower motor, the filter, the duct system, and the static pressure the whole assembly is fighting. In a ducted-heavy market this is where a large share of Santa Rosa cooling complaints live, and it is where the temptation to condemn a compressor without measuring anything does the most damage to a homeowner's wallet.
Repair or replace, in order
Homeowners usually want a rule, and there is not one clean rule. There is an order. We work through five questions in sequence and stop at the first one that gives a clear answer, because taking them out of order is how people end up buying a system they did not need or repairing one they should have let go.
What refrigerant is in it. This decides more Santa Rosa systems than any other factor, and it is the one most homeowners have never been asked about. Details in the next section.
What failed. A capacitor on a twelve-year-old system is a repair. A compressor or a leaking evaporator coil on that same system usually is not. The component matters more than the calendar until the two disagree.
Age against this climate. Under about ten years, repair is generally right. Ten to fifteen is a judgment call driven by what failed. Past fifteen, in a climate that runs equipment this hard, most systems have already given you their good years.
The repair against the replacement. When a repair starts approaching a meaningful fraction of a new system on aging equipment, you are buying time rather than solving anything. We say so rather than take the work.
How the house performs. If some rooms never cool, or the system has always struggled on the hottest afternoons, then a perfect repair still leaves you uncomfortable. That is a design and duct conversation, and no repair answers it. This is why we look at the whole system rather than just the failed part.
Most Santa Rosa systems get their answer on the first two. The rest of the list exists so the answer holds up.
Refrigerant decides most of it
If your system went in before roughly 2010, it very likely runs on R-22. Production and import of R-22 in the United States ended in 2020, so any R-22 a repair requires now comes from reclaimed or stockpiled supply. That supply is finite and the cost of it is not going in a friendly direction. On an R-22 system with a leak, that single fact usually settles the repair-or-replace question by itself, and any Santa Rosa homeowner being quoted a large R-22 repair deserves to be told why before authorizing it.
Newer systems use R-410A, which is itself being phased down under the federal AIM Act. New residential equipment has been moving to lower global warming potential refrigerants, under a 700 GWP limit on newly manufactured residential and light commercial equipment. This does not mean an R-410A system needs replacing. It will be serviceable for years, and we service them daily. It is context worth having when you are weighing a major repair on a system that is already twelve or fourteen years old.
We identify what is in your system and tell you what it means for the decision in front of you. It is one of the clearest cases in this trade where knowing the technical reality saves a homeowner real money.
In Santa Rosa, an AC decision is also a furnace decision
This is the part that genuinely differs by which side of Sonoma County you live on, and it is worth understanding before you replace anything.
Santa Rosa sits fully inside the Bay Area Air Quality Management District. Northern Sonoma County towns like Cloverdale, Healdsburg, and Guerneville do not, and Windsor and Sebastopol straddle the boundary. That distinction matters because BAAQMD has adopted zero-NOx requirements for residential space heating and water heating appliances that the northern district has not.
The reassuring part of the district's own framing is worth quoting directly: "These new requirements apply only upon burn out of one's current equipment." Nobody is coming for a working furnace.
Why this lands on an air conditioning page: in a conventional Santa Rosa home, the AC and the furnace are one system. They share a cabinet, a coil, a blower, and a duct run. When a condenser fails on a fifteen-year-old system, the furnace attached to it is also fifteen years old, and replacing one without the other means paying twice for access, twice for permits, and living with a mismatched pairing that runs at neither component's rated efficiency. The furnace rule's 2029 date does not force anything today. It does mean that if you are already replacing the outdoor half of an aging system in Santa Rosa, the sequencing question deserves five minutes of real conversation rather than being deferred to whenever the furnace happens to quit.
The same district also amended Regulation 9, Rule 6 for residential water heaters, with dates that land on different water heater types in 2027 and 2031, and that govern what may be sold or installed rather than what you may keep. We confirm current requirements at the time of your project rather than quoting a rule that changed.
Ricardo was on time and very professional and pleasant. He took the time to explain to me all the aspects of my AC service.
Teresa J.
What drives the cost of AC repair in Santa Rosa
We do not publish flat repair prices, because an air conditioner is not a flat problem and nobody can quote one over the phone with any confidence. What you should understand is what moves the number.
The specific failure. A capacitor and a compressor are the two ends of a very wide range. This is why the diagnosis comes first and the price comes after it.
Refrigerant type and quantity. An R-22 system needing charge is materially more involved to service than an R-410A system, for the supply reasons above. Quantity matters too: a larger system holds more.
Whether the leak has to be found. Locating a leak in an evaporator coil buried in an attic air handler is a different job than finding one at an accessible service valve, and the first one is worth doing rather than skipping.
Access. Attic air handlers in a Santa Rosa summer, tight closets, and equipment on a roof all take longer than a garage installation and a condenser on an open pad.
Parts availability. Common components ride on our trucks. Proprietary or discontinued parts on older equipment can add days, which matters a great deal during a heat wave.
Whether the repair is worth doing at all. We would rather tell you a repair is not the right money than take it and watch the system fail again next August.
You see the exact cost before we begin, and financing is available on system replacements.
Permits, Title 24, and HERS verification
Straightforward repairs do not require a permit. Replacing equipment does, and this is where California differs from most of the country.
Inside city limits the permit runs through the City of Santa Rosa Building Division, whose building permit page applies the code language directly to mechanical work: a permit is required to "erect, install, enlarge, alter, repair, remove, convert or replace any electrical, gas, mechanical or plumbing system." Properties in unincorporated Sonoma County permit through Permit Sonoma instead.
Permitted HVAC work also carries an energy code dimension. California's 2025 Building Energy Efficiency Standards took effect January 1, 2026, and Title 24 brings third-party HERS verification into many residential HVAC alterations. The California Energy Commission puts it on its HERS program page: "Depending on the work being done, HERS testing may be mandatory. Properly permitted work will trigger any necessary HERS testing." The Commission adds that "a contractor should understand and be able to explain permitting requirements to the homeowner. HERS testing should be part of this discussion."
Two things follow from that. A bid that quietly skips permitting and HERS is not a cheaper bid, it is an incomplete one, and the gap surfaces at resale when the work has no record. And HERS is a genuine quality check performed by a rater independent of the installing contractor, which means somebody other than us verifies that your system was charged correctly and your ducts seal. We pull the permits and coordinate HERS verification on the jobs that require it.
Rebates, and the fire rebuild exception worth knowing
Repairs do not carry rebates. If a repair conversation turns into a replacement conversation, there is real incentive money in Sonoma County, and the eligibility rules have some Santa Rosa specifics in them.
Sonoma Clean Power is the community choice energy provider for Sonoma County, and it offers a rebate on heat pump systems installed for heating and cooling, with qualifying efficiency thresholds that differ by system type for ducted, ductless single-zone, and multi-zone equipment. Customers enrolled in the CARE or FERA bill discount programs qualify for a substantially larger rebate covering a share of the project cost remaining after all other rebates are applied. The installation address must be an active SCP account, applications are due within 90 days of project completion, one rebate is available per equipment type per account, and dual fuel systems are not eligible.
The detail that matters here more than anywhere else we work: SCP's own rebate terms state that "New construction is not eligible, with the exception of fire rebuilds." In most cities that is boilerplate. In Santa Rosa it is Coffey Park and Fountaingrove, and the question gets asked rather than assumed.
We confirm eligibility at quote time rather than assuming it.
Maintenance that matters on a Santa Rosa duty cycle
Generic maintenance advice is written for systems that run a hundred hours a summer. Yours runs a great deal more than that, and the items below are ordered by how much they change outcomes here.
- Rinse the outdoor coil every spring. This is first on the list for a reason. Dust and cottonwood pack condenser fins in this valley, and a blocked coil raises the operating temperature of every component behind it. It is also the cheapest thing you can do yourself.
- Change filters before summer and check them mid-season. Restricted airflow is the most common cause of avoidable failures, and on a system running eight hours a day a filter does not last the way the box says it does.
- Run the system in April or May. A fault found in spring is an appointment on your schedule. The same fault found in August is a wait behind everyone else who postponed.
- Keep two feet of clearance around the condenser. Plants, new fencing, and stored items choke airflow, and landscaping grows into that clearance a little more every year.
- Have the condensate drain cleared as part of service. Inland dust loads those lines, and a clogged drain damages the building, not the equipment.
- Do not ignore a new noise. A change in sound, run time, or cooling is the system talking while the repair is still small.
Where we work in Santa Rosa
We serve every Santa Rosa neighborhood from our Petaluma headquarters, including Coffey Park, Fountaingrove, Rincon Valley, and Bennett Valley, along with Roseland, Bennett Ridge, and the surrounding unincorporated areas that permit through Permit Sonoma.
Two Santa Rosa realities shape how we schedule and what we recommend. Summer demand here is spiky rather than steady, so cooling work booked in spring gets the appointment you want. And in the hill neighborhoods, Public Safety Power Shutoffs are a normal part of the fire season, which is why backup power comes up on HVAC projects here. Because we also hold a C-10 electrical license, a generator or a battery can be part of the same project and the same schedule rather than a second contractor and a second permit conversation.
How to choose an AC repair company in Santa Rosa
Ask what the diagnosis includes. A trustworthy visit measures refrigerant pressures, checks the electrical components, looks at both coils, and evaluates airflow before naming a failed part. A company that quotes a compressor without checking charge, airflow, and electrical is guessing, and you should get a second opinion.
Ask what refrigerant your system uses and what that means. If they cannot answer it, they have not looked at the nameplate, and the single most decisive factor in your repair-or-replace decision is not in their recommendation.
Ask whether the price you are given is the price you pay, and whether it is given before the work starts or after.
Ask whether they pull permits and coordinate HERS testing on replacements. The answer tells you whether the bid you are comparing is complete.
Ask how long they have worked in Santa Rosa specifically. This climate and this housing stock teach things that a contractor new to the inland North Bay has not learned yet.
We have answered those questions the same way since 1932: look at the whole system, show you what we found, price it before we work, and say so when a repair is not worth your money. Ongaro & Sons is Diamond Certified, a Mitsubishi Diamond Contractor Elite, a Trane Comfort Specialist, and BBB A+ rated.
AC repair and home services across Santa Rosa and Sonoma County
One company, all trades: Santa Rosa heating and cooling, HVAC across Sonoma County, Santa Rosa home services, Santa Rosa plumbing, and Santa Rosa electrical. Related Santa Rosa services: furnace repair, heat pump service, electrical panel upgrades, and solar and battery storage. Nearby AC repair: Rohnert Park, Windsor, Sebastopol, and Petaluma.
Book AC repair in Santa Rosa
Book online at any hour, or speak to someone during office hours if the situation needs describing. An Ongaro & Sons technician will diagnose your air conditioning, show you what failed, and give you the price before any work begins.
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 Marin, Sonoma and Napa County. 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.
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Read MoreAC repair in Santa Rosa: frequently asked questions
Who is the best AC repair company in Santa Rosa?
Ongaro & Sons has worked in the North Bay since 1932, repairs air conditioning across it, is Diamond Certified, holds C-20 HVAC, C-10 electrical, and C-36 plumbing licenses, and averages 4.8 stars across 2,726 Google reviews. We are a Mitsubishi Diamond Contractor Elite and a Trane Comfort Specialist, we diagnose the entire system before quoting rather than the easiest guess, and you get the price before any work starts.
What does AC repair cost in Santa Rosa?
It depends on what failed. A capacitor or contactor is a modest repair. A refrigerant leak, a condenser fan motor, or a compressor is more involved, and R-22 systems cost more to service because that refrigerant is no longer produced in the United States. Access and parts availability move the number as well. We diagnose first and give you the exact price before we begin.
Should I repair or replace my Santa Rosa air conditioner?
Work it in order. Start with what refrigerant is in the system, then what failed, then the age of the equipment, then how the repair compares against replacement, and finally whether the house has always had comfort problems that a repair will not solve. Under about ten years with a minor failure, repair. Past fifteen, or with a compressor or coil failure, or on R-22, replacement usually wins in this climate.
What refrigerant does my system use, and why does it matter?
Systems installed before roughly 2010 typically use R-22, whose production and import in the United States ended in 2020, which makes leak repairs on those systems progressively more expensive. Newer systems use R-410A, which is itself being phased down in new equipment under the AIM Act as manufacturers move to refrigerants under the 700 global warming potential limit that now applies to newly manufactured residential and light commercial equipment. An existing R-410A system does not need replacing. We identify yours and explain what it means for your decision.
Why does my AC freeze up?
Low refrigerant from a leak, or restricted airflow from a dirty filter, a blocked coil, or a duct problem. The ice is the symptom, never the disease. Shut the system to fan only and let it thaw, then have the cause found, because running an iced system risks liquid refrigerant reaching the compressor.
Do I need a permit for AC work in Santa Rosa?
Not for a straightforward repair. Equipment replacement does require one. The City of Santa Rosa Building Division requires a permit to "erect, install, enlarge, alter, repair, remove, convert or replace any electrical, gas, mechanical or plumbing system," and unincorporated Sonoma County permits through Permit Sonoma. We file the permit and see the inspection through.
What is HERS testing and will my job need it?
HERS is California's third-party verification under Title 24, performed by a rater independent of the installing contractor. The California Energy Commission states that "depending on the work being done, HERS testing may be mandatory" and that "properly permitted work will trigger any necessary HERS testing." Replacements commonly need it and simple repairs do not. We coordinate it when it applies.
Will BAAQMD's rules force me off my gas furnace when I replace my AC?
Not today, and not on working equipment. Santa Rosa is inside the Bay Area Air Quality Management District, which amended Regulation 9, Rule 4 in March 2023 with zero-NOx implementation dates that vary by size and equipment type and 2029 identified for furnaces. The district's own framing is that "these new requirements apply only upon burn out of one's current equipment." What it does mean is that if you are replacing the outdoor half of an aging system, the furnace sequencing is worth discussing now.
Do you repair the heat pump systems in the fire rebuild neighborhoods?
Yes. A large share of Coffey Park and Fountaingrove rebuilds run high-efficiency, often all-electric heat pump systems, including inverter-driven and variable-capacity equipment that behaves nothing like a single-stage condenser. As a Mitsubishi Diamond Contractor Elite we work on these systems constantly, and we service them alongside conventional split systems.
Are there rebates if the repair becomes a replacement?
For heat pump equipment, yes. Sonoma Clean Power offers a rebate on heat pumps installed for heating and cooling, with qualifying efficiency thresholds by system type and a substantially larger rebate for customers enrolled in CARE or FERA. The installation address must be an active SCP account, applications are due within 90 days of completion, and dual fuel systems are not eligible.
I am rebuilding after a fire. Do rebate rules treat that as new construction?
Sonoma Clean Power's rebate terms exclude new construction "with the exception of fire rebuilds," so a rebuild is treated differently than a new home. Confirm eligibility before the equipment is ordered rather than after, and we check the current terms as part of the quote.
My AC runs constantly on hundred-degree days. Is something wrong?
Not necessarily. A correctly sized system in Santa Rosa will run long cycles at design conditions, and long run times are how these systems are supposed to behave in this climate. The question is what the indoor temperature does. If the house holds its setting, the system is working at its limit. If the temperature climbs while the unit runs, something has failed and it should be diagnosed.
Some rooms never get cool. Can that be repaired?
Usually it is not a repair at all. Uneven cooling in a ducted Santa Rosa home is typically a distribution problem: undersized or leaking ducts, poor returns, or static pressure the blower cannot overcome. Repairing the condenser perfectly will not change it. We measure airflow rather than assume, and we tell you when the answer is duct work rather than equipment.
Will you service a Santa Rosa system another company installed?
Yes, across all the major brands and regardless of who put it in. Bring the model and serial numbers if you have them, because they settle refrigerant type, capacity and parts availability before anyone opens a panel. On a system somebody else installed, the first thing worth checking is whether it was commissioned properly: airflow and charge set on install day determine most of what happens for the following decade, and a system nobody measured can pass inspection and still underperform.
Should backup power be part of an HVAC project in Santa Rosa?
It is worth discussing here. After the 2017 Tubbs Fire and the 2019 Kincade Fire, Public Safety Power Shutoffs are a regular part of the fire season in the hill neighborhoods, and cooling equipment only works while the power is on. Because we hold a C-10 electrical license and are a Certified Generac Generator installer, generator or battery backup can be part of the same project and the same schedule.