Furnace & heating
AC repair
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 estimateHVAC Company in Sunnyvale, CA
Sunnyvale’s HVAC work is shaped by what was built here between 1950 and 1970: single-story ranch homes on slab foundations, original galvanized ductwork, and electrical panels that were sized for a different era. Add the Santa Clara Valley’s occasional triple-digit heat waves and the Bay Area’s quiet-hour expectations, and you get jobs that reward a technician who has seen this housing stock before. Coldharbour Heating & Air handles AC repair, furnace repair, and AC installation across Sunnyvale with written upfront pricing and a 365-day repair guarantee. Call (669) 800-4179 any hour, day or night, and a live person picks up.
Why Sunnyvale Homes Are Different
Sunnyvale’s older neighborhoods, including Birdland, Cherry Chase, and Ortega Park, were largely built as tract housing in the 1950s and 60s. That means many homes still run on their original galvanized steel ductwork, which corrodes from the inside over decades and quietly degrades airflow long before a homeowner notices a problem. Undersized electrical panels are common in this era of construction, which affects what a homeowner can install without a panel upgrade. Newer two-story infill construction, by contrast, often skips ductwork entirely in favor of mini-splits or high-velocity systems, so the work varies block by block.
The local climate adds another wrinkle. Sunnyvale’s Mediterranean pattern keeps things moderate most of the year, but when a heat wave settles into the valley, aging AC units in homes with west-facing windows or thin insulation get pushed past their limits quickly. Homeowners often have not run the system hard for months, so the first real strain of summer is when failures surface. Sunnyvale also enforces noise ordinances that matter for condenser placement and fan speed settings, which changes how a thoughtful technician approaches an install or a repair. The work here rewards knowing the houses, not just the equipment.
Styles & brands we work with
Our Main Sunnyvale Services
Most calls we take from Sunnyvale homeowners fall into three categories: an AC unit that quit during a heat spike, a furnace that will not fire on a cold valley morning, or a system that has reached the end of its useful life and needs a proper replacement plan. Each service has its own Sunnyvale page with detailed pricing and local specifics.
AC Repair in Sunnyvale
When a Sunnyvale AC unit fails, the usual culprits are a failed capacitor, a clogged condensate line, or refrigerant that has leaked down slowly over the off-season. In Birdland and similar slab-on-grade neighborhoods, we also see compressor strain from units that were retrofitted into tight spaces with limited airflow. Our technicians diagnose the problem, hand you a written price before any work begins, and back the repair with our 365-Day Done Right Promise. Read the full breakdown on our AC Repair in Sunnyvale page.
Furnace Repair in Sunnyvale
Sunnyvale homes from the 50s and 60s often have furnaces tucked into narrow hallway closets or crawl spaces, which makes access a bigger part of the job than the repair itself. Common failures include worn igniters, failed thermocouples, and blower motors that have accumulated decades of dust on original ductwork. Every furnace repair includes a written guarantee: if the fix fails within 365 days, we return and correct it at no charge. Details and local price ranges are on our Furnace Repair in Sunnyvale page.
AC Installation in Sunnyvale
Installing central AC in Sunnyvale’s older homes is rarely a simple swap. In neighborhoods like Birdland, the original 1950s slab-on-grade construction means there is no crawl space below, so refrigerant lines are often routed through the attic and air handlers are mounted horizontally to avoid cutting concrete. We handle load calculations, panel assessments, and noise-conscious condenser placement, with a fixed written quote before the job is scheduled. Our AC Installation in Sunnyvale page covers the process and pricing in full.
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 Sunnyvale
Our technicians are trained on nine major residential HVAC brands, including Trane, Lennox, and Goodman, plus Rheem and the other systems commonly found in Sunnyvale homes built from the 1950s onward. We stock common parts locally for faster turnaround when a repair cannot wait. See our brands for the full list and what we typically carry.
See the difference
Before
After
Before
After
Before
AfterPricing for HVAC Company in Sunnyvale, CA
| Service | Typical range in Sunnyvale |
|---|---|
| AC repair (diagnostic plus common fixes) | $150 – $650 |
| Furnace repair | $150 – $700 |
| AC installation (full system, equipment and labor) | $3,500 – $7,500 |
| Seasonal tune-up | $80 – $200 |
What pushes a Sunnyvale job toward the upper end of these ranges is usually access: a furnace wedged into a tight closet, a condenser that has to meet strict noise limits, or ductwork that needs real repair rather than a quick patch. Older homes with original galvanized ducting sometimes need more of that work than newer builds. Whatever the total, you get the written price before a tool comes out, and that number does not change at the door.
Neighborhoods We Serve in Sunnyvale
We work throughout Sunnyvale, from the ranch-home streets of Birdland and Cherry Chase to the newer infill construction across the city. Every job gets the same written pricing guarantee and 365-day repair coverage, no matter the neighborhood.
- Birdland
- Cherry Chase
- Ortega Park
- Sunnyvale West
- Lakewood Village
Service Area – Cities Near Sunnyvale
Beyond Sunnyvale, our crews also serve the surrounding Santa Clara Valley communities. If you are in a neighboring city and need the same written-price, written-guarantee standard, see our pages for Mountain View, CA, Santa Clara, CA, Cupertino, CA, and Los Altos, CA.
Serving Sunnyvale, CA - Our Local Coverage Area
We’re based in the Sunnyvale 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 Sunnyvale
We schedule same-day service for most AC and furnace repairs in Sunnyvale, and our phones are answered by a live person 24 hours a day, 7 days a week. Call (669) 800-4179 and you will speak to a person, not a menu, and we will give you a firm arrival window.
Yes. Sunnyvale requires permits for most AC installations and some larger repair scopes, and our team handles the paperwork as part of the job. We factor permit time and cost into the written quote so there are no surprises when the work is scheduled.
We cover all of Sunnyvale, including Birdland, Cherry Chase, Ortega Park, Sunnyvale West, Lakewood Village, and the newer infill developments throughout the city. Scheduling is coordinated from our Bay Area office, and crews are dispatched locally across Sunnyvale.
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 Sunnyvale Customers Say
"Our upstairs never cooled right. He found the duct run was half blocked and the system low on charge, fixed both, and now the whole house is even. Explained every step."
- Deanna Boleyn"New AC and furnace. They gave me a written quote with a couple of options and no pressure. Showed up on the day they promised and the new system is so much quieter."
- Gloria Dunn"New mini split for the addition. Clean install, on time two days running, and the price matched the written quote to the dollar."
- Yvonne Prewitt