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AC Repair in Rohnert Park

Ongaro & Sons is the AC repair company Rohnert Park homeowners call when they want the actual fault found rather than a part swapped. We have worked on North Bay homes since 1932, we cool Sonoma County houses today, we are Diamond Certified, we hold a C-20 HVAC license, and we carry 2,726 Google reviews averaging 4.8 stars. We are also a Mitsubishi Diamond Contractor Elite and a Trane Comfort Specialist. We diagnose the whole system, show you what failed, and give you the price before any work begins.

Why AC repair in Rohnert Park is its own problem

Almost every North Bay city grew in layers. Rohnert Park did not. It was drawn up as a planned community and built out in waves, and the city's own history describes how "in the post-war decades, planners and civic leaders envisioned a modern, livable community with distinct residential neighborhoods, schools, and parks connected by greenways," with incorporation in 1962. Whole streets went in at once, to one set of plans, with one mechanical design.

That produces a housing market unlike anywhere else we work, and it produces one specific hazard in this trade.

The equipment ages out on a shared clock. A tract built in a single season received its furnaces, condensers, and ductwork in a single season. Thirty and forty years later, those systems reach the end of their service lives within a few summers of each other. When we get three calls off the same street during the same heat wave, that is not coincidence, it is the calendar. It also means your neighbor's experience is genuinely informative here in a way it is not in Petaluma or Mill Valley: if two houses on your block replaced their systems last summer, yours is on the same schedule.

The uniformity invites the worst shortcut in the trade. When every fourth house shares a floor plan, it becomes very tempting to size a replacement by what is already on the pad, or by what went into the house next door. That shortcut is wrong more often than it is right, because identical houses stopped being identical decades ago. The two properties diverge on orientation and afternoon sun exposure, on how big the trees around them have grown, on whether the windows were ever replaced, on whether anyone blew in attic insulation, on whether a room was added off the back, on how many people live there and how they use it, and above all on what forty years has done to the ductwork. Same plan, different load. We run a room-by-room load calculation, the method the industry calls Manual J, rather than reading the nameplate on the old unit and ordering its twin.

The systems are ducted, and the ducts are the age of the house. Rohnert Park runs on conventional ducted central systems: a furnace or air handler in a garage or a hall closet, a condenser on a side-yard pad, and supply runs through the attic or under the floor depending on the tract. That matters because in a ducted-heavy market, a large share of "my AC is broken" calls turn out to be delivery problems rather than equipment problems. The condenser everyone assumes is at fault is often working fine while the cooled air is leaking into an attic that reaches punishing temperatures on a July afternoon.

And the heat is real. Rohnert Park sits inland on the Santa Rosa Plain, between Cotati and Santa Rosa, well away from the coastal moderation that keeps west county mild. Cooling here is working equipment, not a comfort accessory, and systems fail during the week they are needed most because sustained load is what finds the weak component.

The Schultz Library on the Sonoma State University campus in Rohnert Park
Photo by Stepheng3, CC BY-SA 3.0, via Wikimedia Commons

What your air conditioner is telling you, by where the symptom shows up

Most symptom lists read as a pile of unrelated complaints. It is more useful to sort them by where you notice the problem, because that is roughly the order in which a technician rules things out.

At the thermostat. The system runs and runs but the house never reaches the setting. On an extreme afternoon that can be a correctly sized system simply at its limit, so what matters is which direction the indoor temperature moves. Holding steady points at capacity, sizing, or duct losses. Climbing while the unit runs points at a failure. Short-cycling, where the system starts, runs briefly, and stops without completing a cycle, is a different signal entirely and a destructive one: it is usually an oversized system, a failing capacitor, low refrigerant, or a fouled coil, and it shortens compressor life every time it happens.

At the vents. Air that is not cold when the system is set to cool means refrigerant loss, a compressor that is not running, or an outdoor unit that is not coming on while the indoor blower is. Air that is cold but weak is a different problem, and in Rohnert Park it is frequently duct leakage, a collapsed or disconnected flex run, a blocked return, or a blower losing capacity.

At the outdoor unit. A hum with the fan not turning is the classic signature of a failed run capacitor and one of the most common calls we take here. Grinding usually means a motor bearing. A startup that dims the lights inside suggests a compressor drawing more current than it should. Silence when the thermostat is calling for cooling points at the contactor, the control circuit, or the capacitor.

At the indoor unit. Ice on the refrigerant line or on the coil is always a symptom rather than a cause, and it means low refrigerant or restricted airflow. Running a system while it is iced up risks liquid refrigerant reaching the compressor, which converts a moderate repair into an expensive one. Water pooling near the air handler is almost always a plugged condensate drain, and in a garage or closet installation that water finds drywall and framing before it finds you.

On the bill. Efficiency loss from low charge, a dirty condenser coil, or a component beginning to fail shows up as a summer bill that jumps without any change in how you live. It is the earliest warning most homeowners actually notice.

What fails, and what the build era has to do with it

Capacitors and contactors. The most common failures we see, and heat is the reason. Capacitors are rated to a temperature range and sustained inland heat ages them quickly. This is usually a same-visit repair and the least costly real fix in air conditioning.

Refrigerant leaks. Refrigerant is not consumed. If a system is low, it has a leak. Topping off without locating the leak sells you the same repair next summer, so we find it, then tell you plainly whether repairing it makes sense given the system's age and refrigerant type.

Condenser fan motors. The outdoor fan rejects heat from the refrigerant. When it quits on a hot Rohnert Park afternoon, head pressure climbs fast and the compressor is the next thing to go if the system keeps running.

Compressors. The expensive one, and usually the point at which the conversation turns from repair to replacement on an older system.

Coils. A dirty condenser coil is an efficiency problem before it is a failure, and side-yard condensers on tight tract lots collect landscaping debris, dust, and pollen. A leaking evaporator coil is a major repair and often a decision point.

Blower motors and airflow. In a ducted market, a failing blower produces exactly the same complaint as a failing condenser: no cool air. Diagnosing airflow before condemning a compressor is the difference between a repair and an unnecessary system sale.

Ductwork. This is the Rohnert Park specialty. Duct systems built into 1960s through 1980s tract homes were designed to the standards of their day, and four decades of attic heat, crawlspace moisture, rodents, and old tape does not improve them. When one tract has a common weakness, we tend to see it house after house on the same street. Sealed and repaired ducts frequently recover more cooling than any part we could bolt onto the condenser.

The Recreation Center on the Sonoma State University campus in Rohnert Park
Photo by Stepheng3, CC BY-SA 3.0, via Wikimedia Commons

Our experience so far with Ongaro has been very positive. Ian came out to take a look at our very old and noisy AC unit. He was polite, courteous, and had so much valuable information for us.

Kristen D.

How we diagnose an AC repair in Rohnert Park

1. The symptom and the history first. When it started, what changed, whether the system has ever been serviced, what the thermostat is doing, and what the house did during the last heat wave. A meaningful number of calls resolve at this stage. 2. Whole-system testing, not a part hunt. Refrigerant pressures with superheat and subcooling, the compressor and its electrical components, both coils, static pressure and airflow, the blower, thermostat operation, and the condensate drain. The loudest symptom is frequently downstream of the real fault. 3. The finding in plain language, with the price before we start. What failed, why it failed, what the fix costs, and whether we think that money is well spent. Nothing begins until you approve it. 4. The repair done to spec. Charge set by weight and measurement rather than by feel, matched components, and a verification cycle before we leave. 5. If replacement is the better answer, a real sizing conversation. A load calculation for your house, not a like-for-like swap of whatever is on the pad. Your orientation, insulation, window condition, and duct condition all belong in that math, and in a city of repeated floor plans they are exactly what differs.

Five things decide repair or replace

There is no universal answer. We walk through all five with you rather than leading with a recommendation.

Age. Under about ten years, repair is usually right. Ten to fifteen is a judgment call driven by the specific failure. Past fifteen, in this climate, a system has generally given you its good years.

What failed. A capacitor on a twelve-year-old system is a repair. A compressor or evaporator coil on that same system usually is not.

Refrigerant type. The factor most homeowners have never heard of, and the one that most often decides the question. See the section below.

Repair cost measured against replacement. When a repair starts approaching a meaningful share of replacement on an aging system, you are buying time rather than solving the problem, and we will say so.

How the house feels. If the back bedrooms never cool, the system may be undersized, oversized, or badly ducted, and repairing it perfectly still leaves you uncomfortable. That is a design conversation, not a repair, and in a tract home it is often a duct conversation.

The refrigerant question, and why it decides so many Rohnert Park systems

If your system went in before roughly 2010, it very likely uses R-22. Production and import of R-22 ended in the United States in 2020, so any R-22 needed for a repair today comes from reclaimed or stockpiled supply. That supply is limited and the economics get worse every year, which changes the repair-versus-replace math on any R-22 system with a leak. Given how much of Rohnert Park's housing predates 2010, this comes up here constantly.

Newer systems use R-410A, which is itself being phased down under the federal AIM Act, and new residential equipment is transitioning to lower global warming potential refrigerants, under a 700 GWP limit on newly manufactured residential and light commercial equipment. To be clear about what that does and does not mean: an existing R-410A system does not need replacing. It will be serviceable for years. It is simply worth knowing when you are weighing a large repair against a new system.

We identify which refrigerant your system uses and explain what it means for your decision. It is one of the clearest cases in this trade where knowing the technical reality saves a homeowner real money.

What drives the cost of AC repair here

We do not publish flat prices, because an air conditioner is not a flat problem. What you should understand is what moves the number before anyone gives you one.

The specific failure. A capacitor and a compressor are not the same job, and no reputable company can quote either one over the phone with confidence.

Refrigerant type and quantity. An R-22 system needing charge is materially more expensive to service than an R-410A system, for the supply reasons above.

Access. A garage air handler with room to work is a different job than a tight hall closet, an attic platform, or a condenser wedged against a fence on a narrow side yard.

Whether the fault is in the equipment or the ducts. Duct repair and sealing is its own scope of work, and on a tract-built system it is frequently the work that fixes the complaint.

Parts availability. Common components ride on our trucks. Proprietary or discontinued parts on older equipment can add days, which matters during a Sonoma County heat wave.

Whether the repair is worth doing at all. We would rather tell you a repair is not worth it than take payment for one that fails again next August.

You see the exact cost before any work begins, and financing is available on system replacements.

Needed bid on replacing air conditioning and furnace. Nick was able to come out that morning. Appreciate the responsiveness and Nick was very thorough in his work up.

Thomas W.

The indoor half of the system ages too

An air conditioner in a Rohnert Park tract home is not a standalone appliance. The condenser outside shares a coil cabinet and a blower with the furnace or air handler inside, and those two halves were installed together and tend to age together. When a compressor fails on a system that old, replacing only the outdoor half often means bolting new equipment to a blower and coil that are on the same countdown.

There is also a regulatory clock on the heating half that does not exist on the cooling half, and it is something to know before you spend money on a partial replacement.

Rohnert Park sits fully inside the Bay Area Air Quality Management District, unlike northern Sonoma County towns such as Cloverdale and Healdsburg, which fall under the Northern Sonoma County Air Pollution Control District instead. The same page states that these requirements apply "only upon burn out of one's current equipment."

Two things follow, and neither of them is alarming. First, nothing requires you to remove a working gas furnace. Second, if you are weighing a significant repair on an aging system now, the furnace half has a horizon worth factoring into the decision, because a full changeout you were going to make anyway may be better made deliberately than under pressure. We confirm current requirements at the time of your project rather than quoting a rule that has moved.

Heating and hot water equipment sharing a utility closet

Permits, the 2025 code cycle, and the verification change that took effect in January

Straightforward repairs do not require a permit. Replacing equipment does.

Rohnert Park takes these through its online permit services, and mechanical, electrical, plumbing and water heater replacements are each their own permit type, so a job crossing trades carries more than one. An address outside the city line falls to Permit Sonoma instead. We pull the permit and meet the inspector.

Rohnert Park has adopted the 2025 California Building Standards Codes, which the city lists as including the 2025 California Mechanical Code and 2025 California Energy Code. California's 2025 Building Energy Efficiency Standards took effect January 1, 2026.

That code cycle brought a change most homeowners and a fair number of contractors have not caught up with. For years, third-party verification on HVAC work was called HERS testing. The California Energy Commission now states that "effective on January 1, 2026, the HERS Program no longer supports an Energy Code compliance demonstration program" and that "the field verification and diagnostic testing scope of the HERS Program regulations has been relocated to the Energy Code Compliance (ECC) Program." The Commission describes the ECC Program as one that "helps a project demonstrate compliance with the Energy Code through testing and documentation."

Three practical consequences for a Rohnert Park air conditioning job:

  • Independent verification still applies to qualifying alterations. The name and the administering program changed. The requirement that someone other than the installer test the work did not.
  • Refrigerant charge verification tightened. The Commission's own program notes revised "refrigerant charge verification (RCV) weigh-in methods" and state that "fault indicator displays (FID) alone may not be used by the installer or rater to demonstrate RCV compliance." In plain terms, a light on the equipment is no longer an acceptable substitute for measuring the charge.
  • Urgent changeouts are accommodated. The Commission notes "an exception for urgent alterations (e.g., HVAC changeouts) that allows the certificates to be registered later," which is the mechanism that lets a household without cooling get equipment running while the paperwork follows.

A bid that skips permitting and verification is not cheaper, it is incomplete, and the gap surfaces at resale when the work has no record. It also removes a genuine quality check: verification is how you find out whether your system was charged correctly and your ducts were sealed.

Rebates and incentives for Rohnert Park homeowners

Repairs themselves do not carry rebates. If your repair conversation becomes a replacement conversation, there is real support available, and the programs move often enough that current information matters more than a list.

Sonoma Clean Power supplies generation across the county, Rohnert Park included, and runs the local incentives. They are separate offers rather than one pot: cooking, heating and cooling, water heating and thermostats each carry their own eligibility, with additional support where a household is enrolled in CARE or FERA. Nothing there funds a cooling-only replacement.

The point of saying so is to stop a rebate figure appearing in your arithmetic that will not appear on your bill.

We confirm what is available for your project at the time of your quote.

Rohnert Park water, dust, and what shortens equipment life

Water hardness matters a great deal to a water heater and very little to an air conditioner, and it is worth saying so rather than implying otherwise. For the record, the city reports that "approximately 70% of the City's water is supplied by SCWA," most of which "originates from the Russian River," with the remaining 30% coming from a series of groundwater wells drawing on the local aquifer. That blend is relevant to the water heater in your garage. It is not what wears out your condenser.

What does wear out cooling equipment in Rohnert Park is more ordinary: sustained summer run hours, a dusty inland growing season, landscaping pressed close against side-yard condensers on compact lots, and condensate lines that clog quietly until water shows up on a garage floor. Those are the failures we see, and every one of them is cheaper to prevent than to repair.

Keeping a Rohnert Park air conditioner out of trouble

  • Change filters before summer and check them again mid-season. Restricted airflow is the single most common cause of avoidable failures and the cheapest thing on this list.
  • Rinse the outdoor coil each spring. Dust and pollen pack condenser fins, and a blocked coil runs hot and dies early.
  • Keep two feet of clearance around the condenser. Fences, stored items, and enthusiastic shrubs all choke airflow, and side-yard installations on tract lots are where this goes wrong most often.
  • Run the system before the first heat wave. A fault found in May is a scheduled appointment. The same fault found in August is a wait, alongside everyone else who postponed.
  • Pour a cup of water through the condensate line's cleanout each season, or have it cleared during maintenance, before the blockage finds your drywall.
  • Pay attention to small changes. A new noise, a longer run time, or slightly less cooling is the system telling you something while it is still a small repair.

Where and when we work in Rohnert Park

We serve every Rohnert Park neighborhood from our Petaluma headquarters, a short run up Highway 101, including the residential tracts across the city and the streets around Sonoma State University. Our satellite locations in Santa Rosa and San Anselmo are shops, not dispatch centers. Every crew, every truck, and every part on it comes out of Petaluma, which is close to Rohnert Park and is why we can keep coverage steady through the summer.

Scheduling in this market is seasonal in a way worth planning around. The first serious heat wave fills every HVAC calendar in Sonoma County within days. Cooling work booked in spring gets you the appointment you want. The same work requested in August gets you a wait.

Because we hold C-20 HVAC, C-10 electrical, and C-36 plumbing licenses, projects that cross trades stay inside one company. If a heat pump conversion turns out to need panel capacity, or if PG&E Public Safety Power Shutoffs in the surrounding area make backup power part of the conversation, that is one schedule and one permit conversation rather than two contractors pointing at each other. We are also a Certified Generac Generator installer.

How to choose an AC repair company in Rohnert Park

A trustworthy repair visit starts with a whole-system diagnosis, not a parts hunt. If a company quotes you a compressor without first checking refrigerant charge, airflow, and the electrical components, get a second opinion.

Ask whether the price you are given is the price you pay.

Ask whether they pull the permit and coordinate independent verification on replacements, and whether they know that the program administering it changed in January.

If they are proposing a replacement, ask whether they ran a load calculation for your house or read the label on your old unit. In a city where the house next door shares your floor plan, that single question separates the companies that measure from the companies that assume.

Ask how long they have worked in Rohnert Park specifically. This housing stock, this build era, and this ductwork teach lessons that a contractor new to the market has not learned yet.

That is how we have worked since 1932: measure the whole system, show you the readings, and price it before touching anything. Ongaro & Sons is Diamond Certified, holds a BBB A+ rating, and is a Mitsubishi Diamond Contractor Elite and a Trane Comfort Specialist.

AC repair and home services across Rohnert Park and Sonoma County

One company, all trades: Rohnert Park heating and cooling, HVAC across Sonoma County, Rohnert Park home services, Rohnert Park plumbing, and Rohnert Park electrical. Related Rohnert Park services: furnace repair, heat pump service, and electrical panel upgrades.

Book AC repair in Rohnert Park

Book online any time, or call during office hours and talk it through with a person first. An Ongaro & Sons technician will test your system as a system, show you what the numbers say, and give you the price before any work starts.

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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Family-owned in the North Bay since 1932

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Every technician is fully licensed and insured, background-checked, and trained on the equipment we install.

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AC repair in Rohnert Park: frequently asked questions

Who is the best AC repair company in Rohnert Park?

Ongaro & Sons has worked across the North Bay since 1932, repairs air conditioning throughout it, is Diamond Certified, holds a C-20 HVAC license, 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, and we give you the price before any work starts.

How much does AC repair cost in Rohnert Park?

It depends on what failed. A capacitor or contactor is a modest repair. A refrigerant leak, condenser fan motor, or compressor is a larger one, and R-22 systems cost more to service because that refrigerant is no longer produced in the United States. We diagnose first and give you the exact price before any work begins.

Should I repair or replace my Rohnert Park air conditioner?

We work through five factors with you: the system's age, what specifically failed, which refrigerant it uses, how the repair cost compares to replacement, and whether the house has ever been comfortable. 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.

My neighbor has the same house. Can you just install what they installed?

We would rather not, and the reason is specific to Rohnert Park. Identical floor plans diverge over forty years on sun exposure, tree growth, window replacement, added insulation, additions, occupancy, and duct condition. We run a room-by-room load calculation for your house. Sizing from the neighbor's system, or from the old unit's nameplate, is how a house ends up with equipment that short-cycles or never quite keeps up.

Why does my AC freeze up?

Low refrigerant from a leak, or restricted airflow from a dirty filter, a blocked return, or a fouled coil. The ice is the symptom, never the cause. We find the underlying problem, because thawing the coil without fixing it only delays the next failure.

Do I need a permit for AC work in Rohnert Park?

Not for a straightforward repair. Equipment replacement does require one. Inside city limits it goes through the City of Rohnert Park Building Division, which accepts mechanical permit applications through its online permit services. Properties in unincorporated Sonoma County permit through Permit Sonoma. We handle it as part of the job.

Is HERS testing still required on HVAC replacements?

The requirement continues, but the program changed. The California Energy Commission states that "effective on January 1, 2026, the HERS Program no longer supports an Energy Code compliance demonstration program" and that field verification and diagnostic testing has moved to the Energy Code Compliance Program. Independent verification of qualifying alterations still applies, and refrigerant charge verification requirements were tightened in the 2025 code cycle. We coordinate it when it applies.

Will gas furnaces be prohibited in Rohnert Park?

No, and nothing requires you to remove working equipment. Factor it into a replacement decision; do not treat it as an alarm. The standard applies to what may be installed, on dates that differ by equipment type and size, and it does not reach a furnace already in service. If your unit is nearing the end of its life anyway, that is the moment the rule becomes relevant to you rather than before.

Why is one room always hotter than the rest of the house?

In a tract-built home it is usually the ducts rather than the equipment: a leaking or disconnected run, an undersized supply to a room that was added later, a blocked return, or attic ductwork losing cooling before it arrives. A perfect repair to the condenser will not fix it. We measure airflow rather than guessing, and duct repair often recovers more comfort than any new part would.

How fast can you get out during a heat wave?

We prioritize no-cooling calls and we run Sonoma County out of Petaluma, minutes down Highway 101 from Rohnert Park, so we keep trucks nearby through summer. The reality of this county is that the first extreme week fills every HVAC calendar, which is why we push spring scheduling for anything you already suspect needs attention.

What refrigerant does my system use, and does it matter?

More than most people expect, and it is the first thing we establish. A system from before roughly 2010 is probably on R-22, which has not been produced or imported into the United States since 2020, so a leak repair draws on reclaimed supply and prices accordingly. That single fact often decides repair against replace on its own. Anything newer is on R-410A, which is itself being phased down in newly manufactured equipment under a 700 GWP limit. Owning an R-410A system obliges you to nothing. We identify yours and explain what it means for your decision.

Are there rebates if I end up replacing the system?

There can be, particularly for heat pumps. Sonoma Clean Power serves Rohnert Park and offers cash rebates for home appliances covering heating and cooling upgrades, along with thermostat programs and additional support for CARE and FERA customers. We confirm what is currently available when we quote.

Will you service a Rohnert Park system another company installed?

Yes, across all the major brands and regardless of who put it in, including the rental properties around Sonoma State and the multi-unit buildings across the city. 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 equipment somebody else installed, the first thing worth checking is whether it was commissioned properly, since airflow and charge set on install day govern most of what follows.

Should backup power be part of the conversation?

It belongs in the discussion. PG&E Public Safety Power Shutoffs reach the areas around Rohnert Park, and cooling equipment works only while the power is on. Because we also hold a C-10 electrical license and are a Certified Generac Generator installer, generator or battery backup can be part of the same project rather than a second contractor and a second schedule.