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.
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AfterFast, Reliable Furnace Repair Across Cotati
Your furnace quits on a January night when the Petaluma Gap is pulling 40-degree air straight off the Pacific, and suddenly you’re deciding between space heaters and a hotel room. Most Cotati furnace repairs run $150 – $700 and our Furnace Repair team can usually get there same day if you call early. We’re dispatched from our San Francisco Bay Area office, and our crews know the local roads well enough to find your place whether you’re off East Cotati Avenue, tucked back in the older tracts near La Plaza Park, or up toward the Rohnert Park border.
We answer the phone live, 24 hours a day. No automated tree, no “leave a message and we’ll call back.” When your heat is out and your home is dropping temperature, that’s not a request for tomorrow. Call (984) 538-9003.
Why Brandt HVAC Is Cotati’s Preferred Furnace Repair Company
Cotati homeowners have a specific reason to be careful about who they let through the door. Our Threshold Verified standard means you get a name, photo, and background-checked profile of your technician before they arrive. They show a photo ID badge at the door. If anyone shows up who you weren’t told to expect, that visit is on us and we make it right.
We’ve built our reputation here by being direct about what things cost and what we’ll guarantee. Every repair starts with a written price you see and approve before any work begins. Every repair also carries a written guarantee under our 365-Day Done Right Promise: if it fails, we come back free, no argument. Our phones are staffed by a live person 24/7, including weekends and holidays, because furnaces don’t break on a schedule.
We know Cotati’s housing stock. The mid-century tracts near West Sierra Avenue, the 1970s builds around the downtown corridor, the converted rentals near Sonoma State’s sphere of influence. These homes have specific furnace issues that repeat, and that local pattern recognition saves diagnostic time and your money.
Heating Repair in Cotati
Heating Repair in Cotati covers everything that gets warm air moving through your vents again: failed ignitors, cracked heat exchangers, blower motors that seized after a dusty summer, gas valves that won’t open, and control boards that lost their minds after a power flicker. Because Cotati’s core housing stock was built between the mid-1960s and early 1980s, we regularly find original forced-air furnaces still running past their intended lifespan, often with ductwork that was sized only for heating and insulation that barely meets modern standards. A typical Heating Repair in Cotati runs $150 – $700 depending on the component and accessibility.
Ignitor and Flame Sensor Failures
Hot-surface ignitors in Cotati’s Goodman and Rheem furnaces tend to fail after 4 – 7 years of seasonal cycling. The part is usually under $100, but accessing it in a tight closet or crawl space adds labor. We test the flame sensor while we’re in there, clean it if it’s salvageable, and replace it if the porcelain is cracked. You’ll get a written price before we start.
Heat Exchanger Safety Checks
A cracked heat exchanger can leak carbon monoxide into your living space. In Cotati’s older atmospheric furnaces, the persistent negative pressure from Gap winds increases backdraft risk, so we inspect heat exchangers with cameras and combustion analyzers as standard practice. If it’s cracked, we’ll show you the image and explain your options: repair, replace the furnace, or in some cases install a safer power-vented unit.
Boiler Repair in Cotati
Boiler Repair in Cotati is less common than furnace work because most local homes run forced-air gas furnaces, but the older multi-family conversions near the Rohnert Park border and some original 1960s builds still use hydronic heat. When a boiler goes down, it’s usually a circulator pump, a failing aquastat, or sediment-choked zones that aren’t calling for heat properly. Because parts availability for older boilers can be spotty, we stock common circulator pumps and zone valves locally and source specialty items fast. A typical Boiler Repair in Cotati falls within the same $150 – $700 range, though complex zone work can push toward the higher end.
Circulator Pump and Zone Valve Issues
Boilers heat water; circulator pumps move it. When a pump seizes or a zone valve sticks, one part of your house goes cold while another stays warm. We test amp draw on the pump, check for air-locked zones, and replace the valve actuator if the motor’s burned out. If your boiler’s original to a 1960s Cotati tract home, we’ll also check whether the expansion tank has lost its air charge.
Pressure and Leak Diagnosis
Boilers need steady pressure, usually 12 – 15 psi on residential systems. A slow leak at a valve or fitting drops pressure until the boiler locks out for safety. We pressure-test the system, identify the source, and repair or replace the component. If your boiler’s in a crawl space or garage, we’ll tell you exactly what access we need before we quote the work.
Trusted Brands We Service in Cotati
We repair Trane, Lennox, Goodman, and Rheem furnaces regularly in Cotati, and we service all major residential HVAC brands including Carrier, York, Daikin, Bryant, and American Standard. Our trucks carry common ignitors, blower motors, capacitors, and control boards for these brands, which means most repairs finish in one visit. For specialty parts, our San Francisco Bay Area dispatch coordinates same-day or next-morning delivery. We don’t guess at compatibility. We cross-reference model and serial numbers before we leave for your home so we’re not making a second trip with the wrong board.
Common Furnace Repair Problems We See in Cotati Homes
- Failed ignitors in original 1970s furnaces. The mid-century tracts off East Cotati Avenue and around La Plaza Park are full of furnaces that have cycled through 40+ winters. Hot-surface ignitors crystallize and crack; we replace them with OEM or upgraded silicon nitride versions that last longer in our marine-influenced climate.
- Blower motors laboring against undersized return ducts. Cotati’s 1960s – 80s builders often ran return ducts too small for modern airflow requirements. The motor works harder, draws more amps, and fails prematurely. We test static pressure and tell you honestly if the fix is a motor replacement or a duct modification.
- Backdraft and combustion safety issues from Gap winds. The channeled Petaluma Gap winds create persistent negative pressure in tighter 1970s homes with atmospheric furnaces. We check for proper draft at the flue with a manometer, and if we find spillage, we don’t just patch it. We explain your venting options, including upgrading to a power-vented or direct-vent system.
- Control board failures after summer dormancy. Cotati’s mild summers mean furnaces sit idle for months. Dust accumulates, capacitors degrade, and the first cold snap in October or November reveals a board that won’t sequence properly. We test every stage of the ignition and heating cycle, not just the symptom.
Pricing for Furnace Repair in Cotati, CA
Most furnace repairs in Cotati fall between $150 and $700, with the majority of common jobs landing in the $200 – $450 range. An ignitor replacement typically runs $150 – $300 parts and labor included. A blower motor replacement is usually $300 – $600 depending on whether it’s a standard or variable-speed unit. Heat exchanger work is less predictable, but we’ll give you a firm written price after inspection, and we’ll show you exactly what we found.
What moves the number: accessibility (crawl space vs. closet), whether the part is in our truck or needs to be sourced, and whether we find secondary issues during diagnostic. We charge for the diagnostic, but if you proceed with the repair, we apply that fee toward the work. You’ll never get a surprise bill. Every price is written and approved by you before we touch a tool. Estimates are free for replacement quotes. Call (984) 538-9003.
We Also Serve Cities Near Cotati
Our crews work throughout Sonoma County, including Furnace Repair in Cotati and neighboring Rohnert Park, Petaluma, Santa Rosa, and Sebastopol. If you’re on the edge of our service area and unsure, call and we’ll tell you straight whether we can get there today or if you’re better served by someone closer. We also handle AC Maintenance in Cotati and AC Repair in Cotati for the growing number of homeowners retrofitting cooling into older furnace-only homes.
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 Furnace Repair in Cotati
We typically arrive same day for Cotati calls placed before 2 PM, and we offer true 24/7 emergency service for no-heat situations in freezing weather. If you call after hours, a live person answers and dispatches the on-call technician directly. Call (984) 538-9003 for today’s schedule.
Yes, we service the full Cotati area including the downtown corridor around La Plaza Park, the residential tracts off East and West Sierra Avenue, and the older multi-family conversions near the Rohnert Park border. Our technicians know the local street grid and won’t waste your time getting lost.
We do not charge overtime rates for nights, weekends, or holidays. The repair costs the same at 9 PM on a Saturday as it does at 10 AM on a Tuesday. You’ll get the same written upfront price either way. If a repair fails under our 365-Day Done Right Promise, the return visit is free regardless of when it happens.
Cotati pricing is consistent with our broader Sonoma County rates. The $150 – $700 range applies across our service area. What varies is travel time, and since Cotati is compact, we often spend less time in transit than we do crossing Santa Rosa. That efficiency can mean faster arrival, not higher cost.
Every repair is guaranteed for 365 days under our Done Right Promise. If the same component fails within that year, we return and fix it free of charge, including parts and labor. We put this in writing on every invoice. No argument, no additional charge, no expiration-date games. Call (984) 538-9003 for an exact quote on your specific repair.
Written by Devin Marlowe, Owner at Brandt HVAC, serving Cotati and Sonoma County homeowners with verified, upfront furnace repair since 2003.