Fast, Reliable AC Repair & Installation Across Sebastopol
AC repair in Sebastopol typically runs $150–$650, while a full AC installation for homes without existing ductwork starts around $3,500 for a ductless mini-split system. Most repair calls we receive in the 95472 and 95473 ZIP codes are same-day or next-day. Call Stonegate Heating & Air California at (855) 467-1888 for a free estimate.
We’ve been driving out to Sebastopol from our Sacramento base for 16 years, and the jobs here are unlike anything else in Sonoma County. The persistent marine fog rolling in from Bodega Bay keeps things mild most summers, but that same damp air is quietly destroying the flex duct and heat exchangers tucked into crawl spaces beneath pre-1970s bungalows and old farmhouses. When Sebastopol homeowners call us, they’re usually dealing with two problems at once: a house that was never built for cooling, and a crawl space that’s been degrading whatever ductwork was added later.
Our AC Repair & Installation team knows the Gravenstein Highway corridor, the neighborhoods around Pleasant Hill Road, and the older parcels off Bodega Avenue where original wall furnaces still click on every October. Jason Trent, our owner and Field Supervisor, has personally supervised mini-split retrofits in homes where no contractor had ever proposed a solution that didn’t involve tearing out walls.
Why Stonegate Heating & Air California Is Sebastopol’s Preferred AC Repair & Installation Company
Local reputation built on 16 years and nearly 500 reviews. Our 4.7-star average across 499 verified reviews reflects jobs we’ve actually completed, not a handful of cherry-picked testimonials. Sebastopol customers specifically mention our willingness to work with older homes that other companies turned down.
Owner on the job, not in a back office. Jason Trent holds the title of Field Supervisor, meaning he physically checks sites, reviews load calculations, and makes sure technicians aren’t cutting corners on crawl-space encapsulation or electrical panel assessments. In a town where every third house is a unique retrofit challenge, that matters.
Nine brands, one team. We’re certified to service Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. For Sebastopol homeowners with existing equipment, that means no “we don’t service that brand” dead end. We stock parts and can source units without the delays that come from subcontracting to specialists.
From a single-room mini split to a full commercial system. Whether it’s a 1920s craftsman near downtown Sebastopol needing one ductless head in the living room, or a winery tasting room off Highway 116 requiring zoned cooling, we handle the full scope. Emergency HVAC available.
Our AC Repair & Installation Services in Sebastopol
AC Repair
Most AC repair calls in Sebastopol aren’t actually about the outdoor condenser. They’re about what the damp marine air has done to the system. We regularly find refrigerant leaks in corroded line sets running through crawl spaces, failed capacitors in units that short-cycle because of restricted airflow from collapsed flex duct, and compressors working overtime because the house has no return air path. A typical AC repair in Sebastopol runs $150–$650 depending on whether we’re replacing a capacitor or recovering refrigerant to braze a leak. We diagnose first, explain what we found, and give you a fixed quote before touching tools.
AC Installation
This is where Sebastopol’s housing stock gets interesting. The vast majority of homes here were built before 1980 with only a wall or floor furnace and zero cooling infrastructure. The 2017–2021 Sonoma heat domes shattered the old assumption that AC wasn’t necessary, creating sudden urgent demand for systems that can handle both the damp, cool heating season and the now-occasional extreme heat event. For homes without ductwork, which is most of them, we install ductless mini-split systems from brands like Daikin, Carrier, and American Standard. A full AC installation in Sebastopol typically ranges from $3,500 to $7,500 depending on the number of zones, electrical upgrades needed, and whether we need to encapsulate the crawl space first. Sizing must account for humidity removal in winter, not just cooling load in summer.
AC Replacement
When an existing AC system in Sebastopol reaches the end of its service life, replacement is rarely a simple swap. The original installation was often a 1980s or 1990s retrofit with flex duct run through a crawl space that wasn’t designed for it. By the time the condenser fails, that flex duct is usually compromised by ground moisture. We don’t quote replacement without inspecting the full distribution system. In many Sebastopol homes, what starts as “replace the AC” becomes a more valuable project: new high-efficiency heat pump, sealed ductwork or ductless heads, and a crawl space that stops destroying equipment.
Refrigerant Recharge
Low refrigerant in Sebastopol almost always means a leak, not normal consumption. The combination of pier-and-beam foundations, shallow crawl spaces, and months of fog-driven humidity corrodes copper line sets and braze joints. We don’t just top off the charge. We pressure-test the system, locate the leak with electronic detection or nitrogen tracing, and give you the real fix. A recharge without repair is throwing money into a system that will be low again in six months. In Sebastopol’s climate, that means paying twice for what should have been fixed once.
What happens when you call
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A real person answersNo phone trees — you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Sebastopol
We maintain factory training or direct experience on nine leading HVAC brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. For Sebastopol customers, this matters because many older homes received whatever unit a previous homeowner could source quickly, often a mismatched condenser and coil from different eras. We don’t walk away from those jobs. We stock common capacitors, contactors, and refrigerant types locally, and we can source replacement coils or full systems without the multi-week delays that leave you sweating through the next heat dome. Whatever brand you have, we can work on it.
Common AC Repair & Installation Problems We See in Sebastopol Homes
- Crawl-space flex duct from 1980s–90s retrofits is invariably compromised by ground moisture. The same marine fog that keeps Sebastopol cool in summer drives relative humidity through pier-and-beam foundations from October through April. Flex duct lying directly on dirt or even on shallow joists absorbs that moisture, collapses, grows mold, and leaks conditioned air into the crawl space instead of the house. We find this on nearly every service call in older neighborhoods.
- Older homes with original wall furnaces lack ductwork entirely, making ductless mini-splits the only viable AC solution. But sizing must account for the damp heating season, not just cooling load. A mini-split sized only for the occasional 95°F day will short-cycle all winter trying to dehumidify without ever reaching setpoint comfort. We calculate both loads.
- Historical absence of AC means electrical panels are frequently undersized for modern units. A 100-amp panel with a full wall furnace, water heater, and kitchen load may not have capacity for a 240V condenser or multi-zone mini-split. We assess this before quoting, because mid-project electrical upgrades surprise homeowners and delay completion.
- The persistent marine fog corridor suppresses cooling degree-days but degrades what equipment does exist. Coastal corrosion attacks condenser coils faster than inland locations. We see more frequent condenser fan motor failures and contactor pitting in Sebastopol than in Santa Rosa, seven miles east. Annual maintenance matters more here, not less.
Pricing for AC Repair & Installation in Sebastopol, CA
We’re upfront about numbers because vague pricing wastes everyone’s time. Here’s what AC work costs in the Sebastopol market:
| Service | Price Range |
|---|---|
| AC Repair | $150 – $650 |
| AC Installation | $3,500 – $7,500 |
| Tune-Up / Maintenance | $80 – $200 |
What moves you within these ranges? For repair, it’s parts (capacitor vs. compressor) and refrigerant type. For installation, it’s the number of ductless zones, whether we need to upgrade your electrical panel, and whether crawl-space encapsulation is required before running line sets. We don’t quote installation over the phone without seeing the site, because every Sebastopol home is different. Estimates are free. Call (855) 467-1888 to schedule.
We Also Serve Cities Near Sebastopol
Our service area extends throughout Sonoma County. We regularly run calls to Roseland, Larkfield-Wikiup, Santa Rosa, and Rohnert Park from our Sacramento base, often routing multiple jobs on the same day to keep response times reasonable. If you’re in a nearby community and found this page searching for Sebastopol, we cover your area too.
Serving Sebastopol, CA — Our Local Coverage Area
We’re based in the Sebastopol area and know this community well. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs — AC Repair & Installation in Sebastopol
Yes. Ductless mini-splits are specifically designed for homes without existing ductwork, which describes most pre-1980s housing in Sebastopol. We mount the indoor head on a wall or ceiling, run refrigerant line sets and power through a small exterior penetration, and place the outdoor condenser on a pad or bracket. We arrived at a 1950s farmhouse on the Gravenstein Highway corridor near Pleasant Hill Road where the original wall furnace had been supplemented with a 1990s window unit. The homeowner wanted full AC; we installed a ductless mini-split system from Daikin, running line sets through the shallow crawl space. We also encapsulated the crawl space to prevent future moisture damage to the system. Call (855) 467-1888 for an exact quote — estimates are free.
Yes, and likely encapsulate the crawl space too. Damp flex duct from that era is almost invariably compromised in Sebastopol’s climate. Running new cooling through collapsed, moldy ductwork destroys efficiency and air quality. We inspect the full distribution system before any installation and will show you what we find. In many cases, abandoning the old duct entirely and going ductless is the cleaner solution. Call (855) 467-1888 for an exact quote — estimates are free.
Yes. Sebastopol follows Sonoma County building codes, and any new AC installation requires a permit and inspection. We handle the permitting process as part of our installation service, including load calculations, electrical plans if panel upgrades are needed, and scheduling inspections. The permit cost is typically included in our quoted price, not added as a surprise line item. Call (855) 467-1888 for an exact quote — estimates are free.
You can, but we don’t recommend it for Sebastopol’s climate or housing stock. Window units are inefficient, insecure, and don’t address the humidity that defines your heating season. A ductless mini-split replaces both problems: efficient cooling for heat dome days, and efficient dehumidifying heat for the damp winter months. The wall furnace can stay as backup or be removed when you’re ready. Call (855) 467-1888 for an exact quote — estimates are free.
We size systems for both sensible cooling and latent moisture removal. Sebastopol’s damp marine air means your winter heating load includes significant dehumidification. A mini-split or heat pump sized only for summer peak temperatures will short-cycle all winter, never reaching comfortable humidity levels. We perform Manual J load calculations that account for local design conditions, and we specify equipment with sufficient latent capacity. We also recommend crawl-space encapsulation on nearly every job, because controlling the moisture at its source protects the equipment and the house. Call (855) 467-1888 for an exact quote — estimates are free.
Ready to get your Sebastopol home properly cooled? Whether you’re dealing with a failed capacitor in a retrofitted system or starting from scratch in a bungalow that’s never had AC, we’ll give you a straight assessment and a fixed quote. Call Stonegate Heating & Air California at (855) 467-1888 for your free estimate. Jason Trent, our owner and Field Supervisor, oversees every project personally.
Written by Jason Trent, Owner at Stonegate Heating & Air California, serving Sebastopol and Sonoma County since 2008.