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
AfterFast, Reliable AC Repair Across San Francisco
AC repair in San Francisco typically runs $175 – $765, and most calls we handle are same-day or next-day. The price is in writing before any work starts, and every repair carries a one-year written guarantee. If you’re in the Richmond, the Mission, or out near Ingleside and your system is blowing warm air or short-cycling, call (361) 306-9515 and a live person answers, 24/7. We know San Francisco’s housing stock, and we know why coastal AC units fail differently than inland ones.
At Dalton Heating & Air, we’re not a call center routing a random tech. We’re a Garrison Partners company held to The Garrison Standard since 2003. That means background-checked, uniformed technicians, a written price before any work begins, and a 365-Day Done Right Promise on every repair. If it fails within a year, we return at no charge. No fine print.
Why Dalton Heating & Air Is San Francisco’s Preferred AC Repair Company
San Francisco homeowners call us because the specifics are handled before the truck rolls. Our dispatchers coordinate from our San Francisco Bay Area office, and our crews know the streets here: the tight parking in North Beach, the narrow stairwells in Victorian conversions, the flat-roof condenser placements common in the Sunset and Richmond. That local knowledge means we show up with the right parts and the right plan, inside the stated window.
Marco Benitez, our lead technician, has spent years diagnosing the failure patterns specific to San Francisco’s marine-layer climate and pre-1970 housing stock. When a capacitor fails on a 12-year-old Carrier in the Inner Sunset, Marco doesn’t guess. He tests it, shows you the reading, replaces the part, and hands you a written guarantee for the work. That’s the Garrison Code: arrive on time, price in writing before starting, do the job by the book, leave the site clean, and stand behind the work for a full year.
Every call is answered by a live person, day or night. When your AC dies during a rare heat spike in the Mission, you’re not leaving a voicemail and crossing your fingers. You talk to a real person who can schedule a San Francisco technician immediately.
AC Unit Repair in San Francisco
AC unit repair in San Francisco usually means one of three things: a failed capacitor, a low refrigerant charge from a pinhole coil leak, or a blower motor over-amping from high static pressure in original ductwork. The repair band here runs $175 – $765 depending on what’s actually failed. On a typical call, we start with a diagnostic: multimeter readings on the capacitor, a pressure check on the refrigerant lines, and an amp-draw test on the blower. That tells us the real problem, not a guess.
What We Check First
Capacitors and contactors are the most common failures we find in San Francisco, especially in oversized systems that short-cycle in the fog belt. A capacitor is a small cylinder that gives the compressor and fan motor a starting jolt. When it weakens, the motor hums but doesn’t turn, or the system struggles to start and shuts off after a few minutes.
Refrigerant and Coil Work
Low refrigerant is never normal. If your system is 15% low, there’s a leak, and in older San Francisco housing stock that leak is usually a pinhole in the evaporator coil. We braze the pinhole, recharge to the manufacturer’s spec, and verify the system holds pressure before we leave. A refrigerant recharge, or topping off the cooling fluid your system needs to reach set temperature, is part of a repair, not a substitute for fixing the leak.
AC Capacitor Replacement in San Francisco
AC capacitor replacement in San Francisco is one of the most common repairs we do, and it’s also one of the cheapest: $175 – $405 including the part and labor. The capacitor works like a starter battery for your compressor and condenser fan. In San Francisco’s coastal climate, oversized units short-cycle constantly, and that repeated starting and stopping wears out capacitors years before their rated life. A weak capacitor often looks like a dead compressor to the untrained eye.
Signs of a Failing Capacitor
You’ll hear a humming noise from the outside unit, the fan won’t spin, or the system starts and then trips off within a minute or two. Sometimes the top of the capacitor bulges. A multimeter test confirms it in about five minutes. If the reading is outside the rated microfarad range, the capacitor gets replaced, and the repair falls inside our standard AC Repair pricing band.
Why San Francisco Units Fail This Way
Most AC systems installed in San Francisco are oversized for the actual cooling load. A unit sized for a 100°F climate running in the Sunset or Richmond is starting and stopping every five to seven minutes. That’s brutal on capacitors and compressors. Replacing the capacitor fixes the immediate problem, but if short-cycling is the root cause, we’ll tell you that too, and we’ll explain what a proper load calculation would actually change.
Trusted Brands We Service in San Francisco
Our techs are factory-trained on nine major residential brands, including Trane, Lennox, Goodman, and Rheem. We don’t play the game where a tech tells you a unit is “too old to fix” because he doesn’t carry parts for it. We stock capacitors, contactors, fan motors, and commonly replaced components for the brands most common in San Francisco homes, which means fewer second trips and faster repairs when your AC is down. If you’ve got a Goodman condenser on a flat roof in the Mission or a Rheem split system in a Daly City-adjacent duplex, we can work on it.
Common AC Repair Problems We See in San Francisco Homes
- Short-cycling from oversized tonnage. A system sized for inland heat runs 5 – 7 minute cycles in San Francisco’s coastal fog belt, wearing out the compressor and capacitor prematurely. This is the single most common “it’s broken” call we get, and often the unit itself is fine; the sizing is wrong.
- Low refrigerant from pinhole leaks in older evaporator coils. Pre-1970 San Francisco housing stock often has original copper coils buried in walls. Pinholes develop, charge drops, and the system blows warm air. We find the leak, braze it, and recharge to spec.
- High static pressure from undersized or crushed return ducts. Victorian and Edwardian conversions frequently have return ducts that were never sized for AC. The blower motor over-amps trying to move air, which mimics a failed compressor. We measure static pressure and tell you if the ductwork is the problem.
- Fog-belt electrical corrosion. The Richmond, Sunset, and other west-side neighborhoods sit in the fog line, and salt air accelerates corrosion on condenser connections and contactors. A corroded contactor will often click but not engage, which reads as a dead system.
Pricing for AC Repair in San Francisco, CA
Here’s what you can expect to pay for common AC work in San Francisco. These are real numbers we honor, not bait-and-switch ranges. The price is in writing before any work begins, and it doesn’t change at the door.
| Service | Typical Range |
|---|---|
| AC Repair (diagnostic + repair) | $175 – $765 |
| AC Capacitor Replacement (part + labor) | $175 – $405 |
| Tune-Up / Preventive Maintenance | $95 – $235 |
What moves the price within that band is the part that failed and how long the repair takes. A simple capacitor swap on a rooftop condenser in the Sunset is on the lower end. A compressor replacement or a refrigerant leak that requires brazing inside a wall cavity is on the higher end. Every repair includes a diagnostic. Call (361) 306-9515 for a free estimate. The estimate is in writing, and the price holds.
We Also Serve Cities Near San Francisco
Our crews regularly work in Daly City, Brisbane, Sausalito, and South San Francisco. If you’re just outside the city limits and need AC Repair in San Francisco-caliber service without the runaround, give us a call. Same technicians, same written-price standard, same one-year guarantee.
Serving San Francisco, CA - Our Local Coverage Area
We’re based in the San Francisco 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 AC Repair in San Francisco
If the compressor is healthy and the system is less than about 15 years old, repair is usually the right call, especially in San Francisco where cooling loads are low. But if the compressor has failed or the system is oversized and short-cycling constantly, replacement with a properly sized unit often saves more money over five years than repeated repairs. We’ll show you the test results and give you honest numbers for both paths. Call (361) 306-9515 for an exact quote.
Short-cycling means your system starts, runs five to seven minutes, shuts off, and restarts soon after. In San Francisco, this is usually because the unit is oversized for the city’s actual cooling load. Coastal fog keeps summer design temperatures in the 60s and low 70s, so a system sized for inland heat hits its setpoint too fast. That cycling wears out capacitors and compressors prematurely. A proper Manual J load calculation tells you if the sizing is the problem.
For San Francisco, SEER2 matters less than correct sizing. A high-efficiency system that’s oversized will short-cycle and fail early, erasing any efficiency gains. A properly sized lower-SEER2 unit will use less energy in the Sunset than an oversized high-SEER2 unit, because it runs longer but more stable cycles. When replacement is the answer, we size by load calculation, not by the square footage rule of thumb.
If the outside unit hums but the fan doesn’t spin, or the system trips off after a minute or two, a weak capacitor is the most likely cause in San Francisco. A multimeter test confirms it in about five minutes. If the capacitor is the failure, the fix is $175 – $405 and usually done same-day. If the test shows the capacitor is fine, we keep diagnosing; we don’t sell you a part you don’t need.
A tune-up runs $95 – $235 and includes checking the capacitor, contactor, refrigerant charge, blower amp draw, and condensate drain. In San Francisco, where salt air and fog accelerate corrosion on electrical connections, a yearly check catches small failures before they become no-cooling emergencies in a heat spike. You get a written report of what we found, and our technicians are not paid on what they sell.
Need a San Francisco AC tech who puts the price in writing before starting? Call Dalton Heating & Air at (361) 306-9515. A live person answers, 24/7. Free estimates, written guarantee on every repair, and the 365-Day Done Right Promise. If it’s not done right, we make it right.
Written by Marco Benitez, Owner at Dalton Heating & Air, serving San Francisco since 2003.