Do you actually come out to Atherton, or is San Ramon too far?

Atherton is well within our regular coverage. San Ramon is on the East Bay side of the 680 corridor, and we work across the Peninsula routinely. Scheduling is the same process regardless of city, and travel time does not affect the diagnostic fee.

Is Comfortmaker the right fit for the older ducted systems common in Atherton homes?

It depends on the install. Comfortmaker is built on the same Carrier platform as Heil and Tempstar, so parts availability is strong and the board architecture is familiar to any tech who works that family. For an older Atherton home with existing ducts in reasonable shape, a Comfortmaker furnace or air handler is a reasonable value choice. Where the existing duct layout is poor or the home has no ducts at all, I would talk through a ductless option instead. The honest answer is that the brand matters less than the duct condition and the quality of the installation.

What exactly does the $75 diagnostic include, and what warranty comes with the repair?

The $75 covers a full system evaluation: I pull fault codes, test electrical components, check pressures on a refrigerant system, and give you a written quote before touching anything. If you approve the repair that day, the $75 comes off the total. Parts and labor on the repair are covered for one year. If you are replacing equipment rather than repairing it, new installations carry a ten-year parts warranty and a ten-year labor warranty.

COMFORTMAKER · ATHERTON

Service · All Comfortmaker Models

Comfortmaker Heat Pump, AC & Furnace Repair · Atherton, CA

Comfortmaker heat pump, AC, and furnace repair in Atherton, where Bay-influenced air and large older estates keep outdoor units working hard year-round.

$75 diagnostic (waived with repair)
Same or next-day best effort
CSLB #1136642

Call (925) 999-4095

Comfortmaker in Atherton

Comfortmaker heating and cooling in Atherton.

Atherton sits close enough to the Bay that summer mornings stay cool and damp well into June, but the Peninsula can still push into the 90s during heat waves, and those older walled estates on Valparaiso Avenue or Alejandra Avenue often have aging ducted systems that were installed or retrofitted decades ago. A lot of what I see here is mid-century forced-air setups paired with a split AC condenser out back, which is exactly the hardware Comfortmaker targets. The proximity to the Bay also means outdoor coils and contactors corrode faster than they would in the Tri-Valley, so I pay extra attention to that hardware on every visit.

Comfortmaker shares its control board, igniter, inducer motor, and gas valve architecture with Carrier and Bryant, which means I can pull fault codes off the board and read them directly rather than guessing. On a SoftSound furnace I also check the variable-speed blower module, because that module tends to flag nuisance faults when the filter has been partially blocked over a season. For heat pumps and condensers, I check the capacitor and contactor first since Bay-influenced humidity and salt air accelerate pitting on the contactor points and weaken capacitor tolerance well before the rated service life.

Bay Area HVAC Service is our HVAC division, based out of San Ramon, and Atherton is a regular part of our service area. The diagnostic fee is $75 and we credit it back in full if you proceed with the repair. Before any work starts you get a written quote, no surprises. We carry EPA Section 608 Universal certification and operate under CSLB license 1136642. Repairs are backed by a one-year labor and parts warranty; new equipment installs carry a ten-year parts and ten-year labor warranty. If a rebate applies to your equipment, we confirm the actual current amount at estimate time.

Common repairs we do

What we close on the truck.

Cracked or failed hot-surface igniter. The Comfortmaker HSI igniter is a silicon nitride element that develops hairline cracks from thermal cycling, and in Atherton's damp winters that cycling stress is frequent. The furnace will attempt ignition, the inducer spins up, but the board never senses flame and locks out after two or three tries. I confirm the fault code, test igniter resistance cold, and replace it with the correct OEM-specified element. Because the igniter and flame sensor are on the same service call, I clean and test the sensor at the same time.
Flame sensor carboned over and short-cycling. A dirty flame sensor is one of the most common reasons a Comfortmaker furnace lights, runs for a few seconds, and then shuts back down. The sensor rod builds an oxide layer that reduces the microamp signal the board needs to confirm the burner is holding flame, so the board shuts the gas valve as a safety measure. I pull the sensor, clean the rod with a fine abrasive, confirm the microamp reading is back in spec, and check the heat exchanger nearby while access is open.
Condenser capacitor failure and pitted contactor on outdoor AC or heat pump. Atherton outdoor units are exposed to marine-influenced air moving in off the Bay, and that moisture accelerates corrosion on the run capacitor and contactor faster than in drier inland areas. A weak capacitor causes the compressor to draw high start amps, run hot, and eventually trip on thermal protection. A pitted contactor causes hard-start behavior or intermittent cooling loss. I test capacitance and contactor resistance on every outdoor call, replace any component outside tolerance, and check the line-set service valves for the same corrosion.

Models we service

Comfortmaker product lines.

Gas furnaces (SoftSound and base series)
Heat pumps and AC condensers
Communicating variable-speed systems
Air handlers and coils
Diagnostics, board and igniter repair, warranty work

Pricing and warranty

What it costs. What we stand behind.

$75

Diagnostic visit. Waived when you book the repair with us.
Written

90 days on consumables, 1 year on major parts, 2 years on sealed-system rebuilds. Quoted in writing before work starts.
CSLB

#1136642. Bonded and insured. We file warranty paperwork when applicable.

Nearby cities

Comfortmaker service in neighboring cities.

More cities

Comfortmaker across our service area.

FAQ

Comfortmaker in Atherton questions, answered.

Do you actually come out to Atherton, or is San Ramon too far?

Atherton is well within our regular coverage. San Ramon is on the East Bay side of the 680 corridor, and we work across the Peninsula routinely. Scheduling is the same process regardless of city, and travel time does not affect the diagnostic fee.
Is Comfortmaker the right fit for the older ducted systems common in Atherton homes?

It depends on the install. Comfortmaker is built on the same Carrier platform as Heil and Tempstar, so parts availability is strong and the board architecture is familiar to any tech who works that family. For an older Atherton home with existing ducts in reasonable shape, a Comfortmaker furnace or air handler is a reasonable value choice. Where the existing duct layout is poor or the home has no ducts at all, I would talk through a ductless option instead. The honest answer is that the brand matters less than the duct condition and the quality of the installation.
What exactly does the $75 diagnostic include, and what warranty comes with the repair?

The $75 covers a full system evaluation: I pull fault codes, test electrical components, check pressures on a refrigerant system, and give you a written quote before touching anything. If you approve the repair that day, the $75 comes off the total. Parts and labor on the repair are covered for one year. If you are replacing equipment rather than repairing it, new installations carry a ten-year parts warranty and a ten-year labor warranty.

Need Comfortmaker service in Atherton?

Tell us what is broken. We will quote it.