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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AfterHVAC Company in Los Altos, CA
Most Los Altos homes were built between 1950 and 1975 without air conditioning, because the marine-cooled western Santa Clara Valley rarely needed it. Today, heat dome events pushing past 95°F for days at a time, combined with whole-home renovations and ADU construction, mean homeowners are retrofitting cooling into attic duct systems never designed for it. Coldharbour Heating & Air handles AC repair, furnace repair, and AC installation across Los Altos, with technicians trained on Goodman, Rheem, York, and Daikin systems. Call (817) 402-2972 and a live person answers, 24 hours a day.
Why Los Altos Homes Are Different
Los Altos sits at the western edge of the Santa Clara Valley, where afternoon marine air slips through gaps in the Santa Cruz Mountains. That natural cooling is why developers skipped AC entirely in the ranch-style subdivisions that dominate the city. Those same homes now present a specific challenge: original ductwork, where it exists at all, was sized and routed for heating only, snaking through unconditioned attics that hit 140°F in July.
Retrofitting cooling into these systems is not a simple equipment swap. Contractors must redesign static pressure, add return air pathways, and ensure California Title 24 compliance, all while the Bay Area Air Quality Management District pushes electrification timelines. Meanwhile, the ADU boom has created a parallel track: a $2M+ lot with a backyard cottage often ends up with a ductless mini-split as the only mechanical cooling on the property, which becomes the proof-of-concept for whole-home upgrades.
Our Main Los Altos Services
Los Altos homeowners call us most often for cooling emergencies in homes that were never built to handle heat, and for heating repairs in aging furnaces that have run through decades of mild winters.
AC Repair in Los Altos
When a retrofitted AC system fails in Los Altos, the root cause is usually airflow, not the compressor. Attic ducts undersized for cooling load, collapsed flex runs, or a refrigerant leak in linesets that were routed through 140°F attics. Our technicians carry capacitors, contactors, and refrigerant to restore cooling same-day when possible, and we test static pressure before declaring a repair complete. AC Repair in Los Altos covers diagnostics, refrigerant work, and electrical repairs on all major brands.
Furnace Repair in Los Altos
Los Altos furnaces are typically original to 1960s-1980s construction, with heat exchangers that have cycled through thousands of mild winters but may show stress cracks when finally pushed hard. Igniter failures, limit switch trips, and blower motor bearing wear are the common calls. We inspect the heat exchanger with a camera on every repair, document findings in writing, and hand you the price before touching a tool. Furnace Repair in Los Altos includes full safety testing.
AC Installation in Los Altos
Installing AC in a Los Altos home that never had it means load calculation first, then duct redesign, then equipment selection. We size for the actual envelope, not the original heating-only plans, and we handle Title 24 compliance documentation for permit closeout. Many jobs start with a ductless mini-split in an ADU and expand to whole-home zoned systems. AC Installation in Los Altos includes written fixed pricing and scheduled install dates, not same-day promises.
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 Los Altos
Our technicians train continuously on Goodman, Rheem, York, and Daikin residential systems, and we stock common capacitors, contactors, igniters, and blower motors for faster turnaround. For parts we don’t carry, our San Francisco Bay Area dispatch coordinates same-day or next-morning supply runs. our brands
Pricing for HVAC Company in Los Altos, CA
| Service | Typical range in Los Altos |
|---|---|
| AC Repair | $150-$650 |
| Furnace Repair | $150-$700 |
| AC Installation | $3,500-$7,500 |
| Tune-Up | $80-$200 |
What pushes Los Altos jobs toward the higher end: attic duct redesign on retrofits, Title 24 compliance documentation, and mini-split electrical runs in homes with full electrical panels. Every job starts with a written price handed to you before work begins, part of The Kingswell Way. That price does not change at the door.
Neighborhoods We Serve in Los Altos
Our crews work across the full city, from the older ranch tracts near downtown to the hillside rebuilds along the Foothill Expressway corridor. Most Los Altos calls reach a technician within 90 minutes during business hours, with live phone coverage around the clock for emergencies.
- Loyola Corners
- South Los Altos
- North Los Altos
- Country Club
- Rancho
Service Area – Cities Near Los Altos
We dispatch from our San Francisco Bay Area office to cover Los Altos and surrounding communities. Homeowners in Mountain View, CA, Stanford, CA, Palo Alto, CA, and Portola Valley, CA can call the same number for service. Each city has its own permit environment, climate exposure, and housing stock, and our technicians adjust accordingly.
Serving Los Altos, CA - Our Local Coverage Area
We’re based in the Los Altos 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 Los Altos
Most Los Altos emergency calls reach a technician within 90 minutes during standard hours, and our phones are answered by a live person 24 hours a day, 7 days a week. After-hours emergencies are dispatched the same way, no voicemail trees. Call (817) 402-2972 for current availability.
Yes. Los Altos requires building permits for new AC installations, and California Title 24 energy compliance documentation is mandatory. We handle permit application and Title 24 paperwork as part of our installation process, with a scheduled install date once permits clear.
Many Los Altos neighborhoods have architectural review requirements for exterior condenser placement and noise levels. We provide equipment specification sheets, noise ratings, and proposed pad locations for HOA submission before installation begins, and we coordinate inspection scheduling around HOA timelines when needed.
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 Los Altos Customers Say
"The repair was done well and quickly. Scheduling over the phone was a little clunky and I got transferred twice, but the tech himself was great and on time."
- Brett Haygood"Furnace was short cycling all winter. They diagnosed a bad sensor instead of condemning the whole unit like I feared. Cheap fix, honest call."
- Russ Tiedemann"Thermostat and a weak blower. Fixed both in one visit, explained the guarantee, and didn't leave a mess. I've already recommended them to my neighbor."
- Natalie Esposito