AC repair
Furnace & heating
Heat pumps
Ductless mini splits
Carrier
Trane
GoodmanSeasonal 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.
Get your free estimateFast, Reliable Furnace Repair Across Danville
When your furnace quits on a cold Danville night, you need a repair team that knows the difference between a Green Valley propane system and a Blackhawk estate’s multi-zone setup. Most furnace repairs in Danville run $150 – $700, and we typically get a technician to your door the same day you call. Our crews work throughout Danville, from Diablo Road to Camino Tassajara, and we arrive with a written price in hand before any work begins. Call (559) 245-8807 and a live person answers, 24/7.
Why Brandt HVAC Co San Francisco Is Danville’s Preferred Furnace Repair Company
Danville homeowners don’t just want a fix. They want to know exactly who’s walking through the door. That’s the Brandt standard. Every technician is background-checked, identity-verified, and sent to you by name and photo before the visit. When they arrive, they show a photo ID badge at the door. If the person standing there isn’t who we told you to expect, that visit is on us.
Devin Marlowe has built our reputation around that certainty. Part of the Threshold Group family since 2003, we’ve handled furnace repairs in Danville’s older estate neighborhoods long enough to know which 1980s systems fail first and which propane setups need a closer look before winter hits. Our Furnace Repair team carries parts for the brands most common in Danville so we’re not running back to a supply house while your house sits cold.
Every job starts with a written price. Every repair includes a written guarantee covering parts and labor for a full 365 days under our Done Right Promise. If the repair fails within that year, we return at no charge. No argument, no fine print.
Styles & brands we work with
Boiler Repair in Danville
Boiler Repair in Danville is a different animal than the forced-air work most East Bay companies cut their teeth on. Older Danville estates, especially along Green Valley Road and up in the unincorporated hills, still run hydronic systems with cast-iron boilers that predate the area’s newer construction. When those systems lose pressure or a circulator pump seizes, you lose heat across the entire house, not just one zone. Typical boiler repairs in Danville run $150 – $700 depending on whether it’s a failed aquastat, an air-bound loop, or a leaking relief valve.
Pressure Loss and Air-Locked Loops
We see a lot of low-pressure lockouts in Danville boilers during the first cold snap. The system sits idle through a warm October, then fires hard in November and the expansion tank gives out. That shuts the whole loop down, and the house goes cold fast.
Circulator and Zone Valve Work
Multi-zone hydronic systems in larger Danville homes often lose one zone before the others. If one wing of the house is cold and the rest is fine, it’s usually a stuck zone valve or a failing circulator pump, both of which we can diagnose and replace on the first visit.
Gas Furnace Repair in Danville
Gas Furnace Repair in Danville comes with a wrinkle many homeowners don’t expect: plenty of the town’s estate properties don’t actually run on utility natural gas. The rural pockets and ridgeline lots in Green Valley and along unincorporated Danville hills rely on propane, and those systems need different diagnosis than the standard gas furnace you’d find in San Ramon. Repair pricing runs $150 – $700 for most jobs, from ignitor swaps to gas valve replacements.
Propane System Repairs and Dual-Fuel Changeovers
Dual-fuel setups that switch between propane heat and electric heat pump operation based on outdoor temperature are common on Danville’s larger lots. When the changeover control fails or the thermostat loses its programming, the system can lock itself out entirely. We calibrate those changeover points so the furnace fires when it should and doesn’t short-cycle when the heat pump is trying to carry the load.
Burner Lockouts and Combustion Air Problems
Exposed ridgeline homes with no wind shelter create combustion air problems that city homes never see. Gusts disrupt the burner flame, the flame sensor reads it as a failure, and the furnace locks out. We correct that with proper intake shielding and flame sensor calibration, not by resetting the switch and hoping for calm weather.
Trusted Brands We Service in Danville
We work on every major residential brand you’re likely to find in Danville, but we stock parts locally for the ones we see most: Goodman, Rheem, and Daikin furnaces are common in this area’s 1980s and 1990s construction, and York units show up regularly in the newer Blackhawk builds. Because our team keeps Danville-specific inventory, we often complete a repair the same day rather than ordering a part and coming back. If your furnace is one of those brands and it’s down, call (559) 245-8807 and tell us what you’ve got. We’ll bring the right parts.
See the difference
Before
After
Before
After
Before
AfterCommon Furnace Repair Problems We See in Danville Homes
- Propane tanks running dry on cold nights. No gas utility auto-refill means a forgotten tank level check becomes an emergency no-heat call. We always ask Danville propane customers when the tank was last topped off.
- Wind-driven burner flame-outs on exposed ridgelines. Properties on Diablo-adjacent hills and open Green Valley lots have no wind shelter, and gusts disrupt combustion air enough to trip the flame sensor. The furnace locks out and stays out.
- Cracked heat exchangers in 1980s equipment. The original furnaces in Danville’s 1970s-1990s estate homes are at the end of their service life, and heat exchanger failures are the most serious common failure we find. That one needs to be caught before it becomes a carbon monoxide risk.
- Overheating blower motors from long duct runs. High ceilings and sprawling floor plans mean long duct runs and low static pressure. The blower motor works harder than it should, overheats, and the limit switch trips repeatedly.
Pricing for Furnace Repair in Danville, CA
Furnace repair in Danville runs $150 – $700 for the vast majority of jobs. An ignitor replacement lands at the low end, around $150 – $300 parts and labor included. A gas valve replacement or blower motor job pushes toward the mid-to-high range, $400 – $700. Boiler repairs run the same $150 – $700 band depending on the component. The only way to know your exact number is for us to look at the system, but you’ll get that number in writing before any work starts. No surprises, no pressure. Call (559) 245-8807 for a free estimate.
| Repair Type | Typical Danville Price Range |
|---|---|
| Furnace Repair | $150 – $700 |
| Gas Furnace Repair | $150 – $700 |
| Boiler Repair | $150 – $700 |
We Also Serve Cities Near Danville
Our Furnace Repair in Danville service area covers the surrounding communities, too. We regularly handle furnace work in Walnut Creek, Hayward, Pleasant Hill, and Castro Valley. If you’re just over the Danville line, give us a call, we’ll likely be there just as fast.
Serving Danville, CA - Our Local Coverage Area
We’re based in the Danville 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 Danville
Wind gusts on exposed Green Valley lots disrupt the combustion air your furnace needs, which trips the flame sensor and locks the system out. The fix is usually a combination of intake shielding, flame sensor cleaning or replacement, and sometimes relocating a fresh-air vent. This is one of the most common ridgeline furnace failures we correct in Danville.
A cracked heat exchanger often shows up as a yellow, flickering flame instead of a steady blue one, soot around the burner area, or a furnace that runs but produces weak heat. Some homes also report a faint odor. This is a safety issue, not a comfort issue, engine. Have it inspected before running the heat, especially in an older Danville home where the original unit is past 30 years old. Call (559) 245-8807 and we’ll check it.
A dual-fuel system pairs an electric heat pump with a propane furnace, and a thermostat or control board switches between them based on outdoor temperature. Danville’s unincorporated hills and Green Valley estates often lack natural gas lines, so this setup gives homeowners efficient electric heat in mild weather and propane heat when it gets genuinely cold. We calibrate and repair these changeover systems regularly.
Every fall, before the cold settles in. Large homes with long duct runs and high ceilings put more strain on the blower motor and burn more fuel, and propane tanks don’t auto-refill. An annual tune-up catches low tank levels, failing ignitors, and static pressure problems before they become a no-heat emergency in January.
Yes, but only as a separate repair. The furnace and the air conditioner are two different systems that share ductwork and a blower, and we can work on both during the same visit. Many Danville homes still run original R-22 condensers that fail quietly each June, and while repair is possible while parts last, replacement planning is worth having sooner rather than later. We’ll give you an honest read on both systems.
If your furnace is down in Danville, don’t wait out a cold night. Call (559) 245-8807 and we’ll answer, send you the technician’s name and photo before arrival, and put a written price in your hand before any work begins. Devin Marlowe’s team is ready for the call.
Written by Devin Marlowe, Owner at Brandt HVAC Co San Francisco, serving Danville since 2003.