Seasonal tune-up and full diagnostic on your Carrier, Trane, or Goodman system - readings shown to you before any repair is proposed
Diagnosis first, numbers second - you approve the repair price before a single part goes in.
Before
After
Before
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Before
AfterHVAC Company in Cotati, CA
Most Cotati homes were built without ductwork, so our HVAC work here centers on adding cooling and heating to houses that never had it, not just swapping old equipment for new. We’re Coldharbour Heating & Air, and our technicians serve Cotati from our San Francisco Bay Area dispatch office, bringing the Kingswell Guarantee to every job: a written price before we start, a firm arrival window, and our 365-Day Done Right Promise on every repair. Call us at (817) 402-2972 for a free estimate.
Why Cotati Homes Are Different
Cotati sits in the Petaluma Wind Gap corridor, a geographic funnel that pulls cool, foggy marine air inland from the coast. For decades, that kept summers mild enough that builders skipped air conditioning entirely. Most homes here, especially the modest single-family tracts and small rentals built between the 1950s and 1970s for the Sonoma State University crowd, came with simple gas wall heaters or gravity floor furnaces and no forced-air system at all.
The extreme heat events that have hit Sonoma County since 2017 changed everything. Cotati homeowners who never needed cooling now do, and they’re calling us to add it to houses with zero existing infrastructure. That means our Cotati jobs are often full system designs, not equipment swaps. We regularly walk into homes on East Cotati Avenue or near the La Plaza shopping area where there’s no air handler, no plenum, and no return path. We design around tight interior layouts and find paths for refrigerant lines through crawl spaces or attics that were never meant to carry them.
The same wind gap geography that moderates summer heat also produces damp, chilly winters and persistent fog. That moisture collects around outdoor condenser units in exposed side yards, accelerating coil corrosion on equipment that sits too close to fences or vegetation. We see this on homes throughout the older neighborhoods near Old Redwood Highway.
Our Main Cotati Services
These are the three services Cotati homeowners call us about most. Each has its own dedicated page with full details.
AC Repair in Cotati
When an AC unit quits in Cotati, it’s often a ductless mini-split that was added to a home with no prior cooling. We repair compressor failures, refrigerant leaks, and electrical faults in these systems, plus traditional central air where it exists. The damp coastal fog here can corrode outdoor coil fins faster than inland locations, so we check for airflow restrictions caused by salt and moisture buildup. Our technicians carry parts for Goodman, Rheem, and other major brands to complete most repairs in a single visit. AC Repair in Cotati
Furnace Repair in Cotati
Many Cotati furnace calls aren’t furnaces at all, they’re wall heaters or floor furnaces in original 1960s homes. We service these legacy units where they’re still viable, and we diagnose when a standalone wall heater has reached the end of its safe operating life. For homes that have upgraded to forced air, we repair gas valves, igniters, heat exchangers, and blower motors. The Kingswell Guarantee applies to every repair: written price first, written 365-day guarantee before we leave. Furnace Repair in Cotati
AC Installation in Cotati
This is the defining HVAC job in Cotati right now. With no existing ductwork in most homes, we design and install ductless mini-split systems that provide cooling and often heating through individual wall-mounted heads in each room. We size the system correctly for the home’s layout, run refrigerant lines and power through minimal wall penetrations, and handle all permitting. For the rare home with existing ducts, we install central air and heat pumps. Every installation gets a written fixed price and a scheduled install date. AC Installation in Cotati
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in Cotati
Our technicians are trained to service nine major residential HVAC brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. We stock common parts for Goodman, Rheem, and York locally, which keeps most repair visits to a single trip. our brands
Pricing for HVAC Company in Cotati, CA
| Service | Typical Range in Cotati |
|---|---|
| AC Repair | $150-$650 |
| Furnace Repair | $150-$700 |
| AC Installation | $3,500-$7,500 |
| Tune-Up | $80-$200 |
What pushes Cotati jobs toward the higher end: homes with no existing ductwork need complete system design, electrical upgrades, and dedicated circuit runs for new mini-split installations. Coastal moisture exposure can also mean more extensive coil or electrical repairs than inland locations see. Whatever the scope, you’ll get a written price before any work begins, and that price doesn’t change when we’re at your door.
Neighborhoods We Serve in Cotati
Our technicians work throughout Cotati, from the original downtown grid to the residential streets that expanded toward Sonoma State. Most calls reach us within 30 minutes during standard dispatch hours.
- Old Cotati / Downtown Core
- East Cotati (near Old Redwood Highway)
- Sonoma State University vicinity rentals
- La Plaza area
- West Cotati residential streets
Service Area – Cities Near Cotati
We dispatch technicians to surrounding Sonoma County communities from our Bay Area office. If you’re just outside Cotati city limits, we also serve Rohnert Park, CA, Petaluma, CA, Santa Rosa, CA, and Sebastopol, CA. Call (817) 402-2972 and we’ll confirm coverage for your address.
Serving Cotati, CA - Our Local Coverage Area
We’re based in the Cotati 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 About HVAC Company in Cotati
We answer calls live 24 hours a day, and our Bay Area dispatch routes technicians to Cotati throughout the day. Most standard calls are scheduled same-day or next-day; true emergencies like complete heat failure during a cold snap get priority routing. Call (817) 402-2972 and we’ll give you a firm arrival window.
Yes. The City of Cotati requires permits for new HVAC installations, including ductless mini-splits. We handle the permit application and inspection scheduling as part of every installation job, so you don’t need to visit City Hall yourself.
We can service many original wall heaters and floor furnaces, but we also give honest assessments when a unit is no longer safe to operate. In those cases, we’ll explain your replacement options, including ductless systems that don’t require adding ductwork to a home that never had it. Call (817) 402-2972 for a free evaluation.
What happens when you call
- 1A real person answersNo phone trees - talk to a local hvac pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Cotati Customers Say
"Furnace was short cycling all winter. They diagnosed a bad sensor instead of condemning the whole unit like I feared. Cheap fix, honest call."
- Russ Tiedemann"Thermostat and a weak blower. Fixed both in one visit, explained the guarantee, and didn't leave a mess. I've already recommended them to my neighbor."
- Natalie Esposito"Honest to a fault. Two companies told me I needed a whole new unit. Coldharbour said mine had years left and just needed a cleaning and a part. Saved me thousands."
- Marcus Reilly