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
After
Before
AfterHVAC Company in Cotati, CA
Most Cotati homes were built without central air conditioning. When summer heat spikes hit, families call us for same-day furnace repair or emergency AC fixes on systems that were retrofitted into 1970s ductwork never designed for cooling. Brandt HVAC dispatches background-checked, uniformed technicians to Cotati from our San Francisco Bay Area office, and we’ll send you their name and photo before they arrive. Call (984) 538-9003 anytime; a live person answers, 24 hours a day.
Why Cotati Homes Are Different
Cotati sits squarely in the Petaluma Gap wind corridor, which funnels cool marine air inland from the Pacific. That breeze convinced builders of the 1960s through 1980s housing stock to skip AC entirely and rely on natural ventilation. Now summer heat events are intensifying, and homeowners who finally want cooling find us retrofitting furnace-only duct systems that were never engineered for the job.
We regularly open attics in neighborhoods like the older tracts near East Cotati Avenue and find undersized trunk lines, minimal insulation, and atmospheric furnaces venting through chimneys never meant to handle the static pressure of added cooling. The channeled Gap winds also create persistent negative indoor pressure in tighter 1970s homes, increasing backdraft risk at the flue. Our technicians run combustion-safety checks here more routinely than colleagues working calmer microclimates just east toward Sonoma.
Student-adjacent rental conversions near the Rohnert Park border add older multi-family stock where deferred maintenance is common. Every job starts with a written price, and every repair carries our written 365-Day Done Right Promise.
Our Main Cotati Services
These are the three services Cotati homeowners call us about most often.
AC Repair in Cotati
When the Petaluma Gap stalls in late August and temperatures spike from the mid-70s to the 90s, homes with retrofitted AC systems fail hard. We see frozen evaporator coils from undersized ducts, compressor strain from refrigerant lines run too long, and electrical issues from panels never upgraded for added cooling loads. Our technicians arrive with parts for Goodman, Rheem, and other major brands, and we send you their name and photo before they knock. AC Repair in Cotati covers diagnostics, refrigerant recharges, compressor work, and full system testing.
Furnace Repair in Cotati
Cotati’s original forced-air furnaces are aging out. We replace failed igniters, clean flame sensors fouled by years of marginal maintenance, and track down heat exchanger cracks that are especially concerning in homes with negative pressure pulling combustion gases backward. Because so many Cotati furnaces are atmospheric (non-power-vented), our combustion-safety check is non-negotiable. Furnace Repair in Cotati includes the repair, the safety test, and our written guarantee.
AC Maintenance in Cotati
Annual tune-ups catch the duct leaks and refrigerant undercharges that retrofitted Cotati systems develop as they struggle against mismatched infrastructure. We measure static pressure, inspect evaporator coils for mold in the marine-cool, damp shoulder seasons, and verify that add-on cooling hasn’t overtaxed the electrical or venting systems. AC Maintenance in Cotati runs $80 – $200 and includes a written report of everything we found.
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
We stock parts and have factory training for Goodman, Rheem, York, and Daikin, plus Carrier, Trane, Lennox, Bryant, and American Standard. Most repairs in Cotati are completed same day because our trucks carry the common igniters, capacitors, and contactors those brands use. Our brands page has the full list.
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 / Maintenance | $80 – $200 |
Prices in Cotati run toward the higher end of these ranges when we need to redesign ductwork for retrofitted cooling or replace obsolete venting to meet current combustion-safety codes. You’ll always get a written price before any work starts, and that price doesn’t change unless you ask for additional work.
Neighborhoods We Serve in Cotati
Our technicians live in the North Bay and can usually reach any Cotati neighborhood within 30 – 45 minutes of dispatch. These are the areas we work in most often:
- Old Cotati (downtown core, pre-1960s homes)
- East Cotati Avenue corridor (1960s – 70s tracts)
- Helen Putnam Park area (late-1970s subdivisions)
- Northwest Cotati near Rohnert Park border (rental conversions)
- La Plaza Park vicinity (mixed-age residential)
Service Area – Cities Near Cotati
We dispatch throughout southern Sonoma County from our San Francisco 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 us 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 typically arrive within 30 – 45 minutes for Cotati calls, and our phones are staffed by a live person 24/7. If your furnace fails during a cold snap or your AC quits when the Gap winds stall, call (984) 538-9003 and we’ll dispatch immediately.
Yes. Adding central AC to a furnace-only system or replacing an atmospheric furnace typically requires a Sonoma County permit and inspection. We handle the paperwork as part of the project, and our written price includes all permit fees so there are no surprises.
We service rental properties throughout Cotati, including the older multi-family conversions near the Rohnert Park border. We coordinate directly with property managers or tenants, send technician photos to whoever will be on-site, and provide written invoices for reimbursement.
Ready to schedule? Call Brandt HVAC at (984) 538-9003 for a free estimate. A live person will answer, we’ll send you your technician’s name and photo before they arrive, and every job starts with a written price you approve before any work begins.
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
"AC stopped cooling on a hot afternoon. Tech arrived with a badge, checked the capacitor, found it bad, and replaced it on the spot. House cooled down within the hour."
- Steve P."Furnace ignitor went out on a cold morning. Part was on the truck, installed in thirty minutes."
- Alvin K."Annual tune-up on the furnace. He cleaned the burners, tested the heat exchanger, and told me what was fine and what to watch. No scare tactics."
- Lorraine E.