It usually happens on a random day. The house has been holding a decent temperature all day, and then it didn’t. The air coming out of the vents is room temperature, or worse, and the thermostat just keeps climbing up. If that’s where you’re at right now, AC repair in Sunnyvale is one call away, and we can usually get someone to your door the same day.
Fuse Service has been fixing, installing and replacing home cooling systems around the Bay Area for more than 15 years now. We as a trusted contractor hold a California HVAC license, we’re fully insured, and we’ve seen just about every failure mode a residential AC unit can throw at us.
AC Service Options for Sunnyvale Homes
We do the full spread of AC service work here, everything from a five-minute filter fix to a complete system swap.
AC Installation
Putting in a new system isn’t a one-size-fits-all job, and we don’t treat it like one. Our AC installation crews measure your square footage, check insulation and duct layout, and pick equipment that’s actually built for your house.
AC Repair
Parts and labor are both covered under warranty, so if something goes sideways after we leave, you’re not on the hook twice.
AC Replacement
There’s a point where fixing an old unit stops making financial sense. We’ll tell you flat out when you’ve hit that point. So don’t be afraid of upselling, you’ll get just the honest math on repair versus a new system.
AC Maintenance
Skipping AC maintenance is how a cheap tune-up turns into a $6,000 replacement two summers later. A yearly check catches a lot of small troubles that can easily turn into breakdowns.
24/7 Emergency AC Repair
Systems don’t ask when it’s comfortable to fail. That’s why our 24/7 line connects you to a professional technician, not a call center reading from a script, any hour your AC repair can’t wait.
If you’re shopping around for air conditioning installation, here’s the short version: we run a real load calculation on every job, not a rough estimate off a chart taped to the wall. Undersize the unit and it’ll run nonstop without ever catching up. Oversize it and you’re paying for capacity you don’t need while the system short-cycles.
Central AC Installation
For most Sunnyvale single-family homes, central AC installation is still the default recommendation, and there's a good reason for that. It cools evenly room to room, it's quieter than a lot of people expect, and it plays nicely with a smart thermostat if you want to add one later.
Ductless AC Installation
Got an addition, a converted garage, or a house that just never had ductwork to begin with? Running new ducts through an existing structure gets expensive fast, and it's messy. Ductless air conditioning sidesteps that whole problem — we can usually have a room cooled within a couple of days.
AC Unit Replacement
A failed compressor or a system still running on discontinued refrigerant is a pretty clear sign. In both of those cases, AC unit replacement almost always beats sinking more money into repairs on borrowed time.
Common AC Problems We Fix in Sunnyvale
No Cool Air
By far our most common summer call. Usually it’s a refrigerant leak, a dead capacitor, or a compressor giving out. And we’ll tell you exactly which one before we start any work, so there’s no mystery numbers in the bill at the end.
Strange Noises or Smells
A grinding sound, a clicking from the outdoor unit, or a burning smell near the vents means something’s actually wrong, not just annoying. Most of the time an AC unit repair clears it up once we’ve narrowed it down to a belt, a motor bearing, or loose wiring.
Thermostat and Airflow Problems
Sometimes it’s not the unit at all — it’s a dead thermostat battery, a filter that hasn’t been changed in a year, or blocked return vents choking off airflow. These are the cheap fixes, and it’s really easier to fix than a broken compressor.
Ductless Mini-Split Trouble
Older neighborhoods of Sunnyvale often need ductless AC repair. It’s where homeowners have installed mini-split systems in extra rooms or in garages that have been converted into living spaces. Leaks in the line set and issues with the indoor head unit are the usual culprits.
Should You Repair or Replace Your AC?
Here’s a rough rule we actually use in the field: if the unit is under ten years old and the problem is contained to one part, air conditioning repair is the smarter call. Once you’re looking at a second major repair inside twelve months, or the system’s already past year twelve, air conditioning replacement tends to pencil out better over the next five years.
We’ll run the numbers for both options on the same visit and let you decide. It’s your house and your budget.
Our AC Repair and Installation Process
Call & Diagnose
Give us a rundown of what’s going on. We’ll get someone out — a lot of the time, that same day.
Clear Options & Pricing
You get a clear explanation of what’s wrong and what it’ll cost before anyone picks up a wrench.
Install or Repair
We do our work and handle local permit requirements with the City of Sunnyvale so it’s off your plate entirely.
Final Walkthrough
Before we leave, we walk you through the system and take whatever questions you’ve got. No rushing to the next job.
Why Sunnyvale Homeowners Call Fuse Service
Licensed, Insured, No Subcontractors
Every technician we send out is background-checked and works for us directly — not a third party we handed your job off to.
Reviews From Actual Sunnyvale Neighborhoods
People keep calling us back for AC service for a pretty simple reason: we show up when we say we will, and we don’t vanish once you’ve paid the bill.
Fair Pricing
We won’t start working until we’ve finalized the budget together with you. So rest assured that there won’t be any hidden fees.
Posted on Yelp
Arun S.
Great work. Thanks Igor and thanks Chris for a professional work done. Our Air conditioning system needed work and you were spot on diagnostics and fix .
Posted on Yelp
Eric A.
Quick easy and painless. Not the cheapest, but they do quality work. I had my bathroom drain cleaned out and pipes snaked.
Posted on Yelp
Stephanie W.
We're just about to have our heat pump and new water heater installed, so I can't speak to that experience yet, but I had to say how helpful their sales rep, Jeff, was with all of my questions to get settled into a plan. I'm one of those people who like to know what's going on line by line, and his patience and knowledge was very appreciated!
Posted on Yelp
Nicasio C.
Received professional service from Fuse from the start of the project to the finish. Project completed was AC and furnace replacement to heat pump and air handler.
Posted on Yelp
Nate M.
Great price to value/service ratio. No complaints and would use their service again.
Posted on Yelp
Frank C.
I had a need to replace our 50G gas water heater. Received several quotes from various contractors. Fuse was the most cost-effective proposal. Quote included new Bradford White heater, new expansion tank (did not have one before), new gas supply line to the heater, new drain pan, new Corro-Protec powered anode to prevent corrosion, and city permit. Installation was smooth. Workmanship excellent. Passed inspection with no issues.
Posted on Yelp
Han Wook C.
Henry and Alex did a fantastic job installing our new heat pump system! They worked hard over two days to get everything set up perfectly. They were punctual, professional, respectful of our home, and extremely knowledgeable. The new system is running great. Huge thanks to Henry and Alex for their hard work--I definitely recommend this team for your HVAC needs!
Posted on Yelp
Matt B.
Update: In what I am pretty convinced was a total coincidence, shortly after the heat pump was installed our gas hot water heater stopped working. I couldn't find anything that the installer would have done to cause it since the symptom was that the gas flame would not stay on. I called Fuse to see what they had to say and within a hour two technicians came out to take a look. After a couple hours of troubleshooting they thought it might be the control board. Of note they didn't charge us for their time. The gas HWH was to be replaced by Fuse with a heat pump based HWH so it seemed silly to invest much effort. Unfortunately there wasn't one of their electricians available for a couple of weeks to install the needed sub-panel. On a follow up call to Fuse, I reminded them that we also have an EV charger in the garage that they might be able to temporarily "borrow" the circuit. The next day the team of Ronnie and Alex came out and installed the new HWH using the EV charger's circuit (having to use a public charger was a small price to pay to having hot water). Once again, a professional job with great attention to detail. Last week Zorik the electrician arrived as scheduled to complete the installation. He worked with me on where I would prefer the sub-panel be installed. Within a few hours, our EV charger was back in business. I appreciated that Zorik took the time to review what breakers were moved so that I could update my records. I was confident that the job (and the others) were all were properly compliant with the building codes. Worth noting, the technician from an independent company came out to do the duct work testing (which passed). As he was leaving the subject of Fuse came up. His comment was that they are the best in the Bay Area.
Posted on Yelp
Jahrell H.
Sergei did an excellent job installing our RO system under the sink and he fixed a leak from plumbing under our home. He is an excellent plumber.
Special Offers for Sunnyvale Customers
Need some extra savings? Just call us to find out what relevant offers we have right now.
It depends on what’s actually wrong, but most standard air conditioning service calls fall into a fairly predictable range once we’ve had a look. We confirm the price before we start, so there’s no guessing.
Most of the time, yes — diagnosed and fixed in one trip. And if it’s an emergency, our support line runs 24/7.
If your system is under ten years old with one isolated issue, choose air conditioner repair. Past that, or after a second big repair in a year, replacement usually wins out financially.
A standard air conditioning installation is typically a one-day job but not always. Ductless setups and larger homes can run a bit longer depending on the layout.
Square footage is only part of it — insulation, window exposure and layout all factor in too. We run an actual load calculation on-site instead of guessing off a chart.
Yes. Ductless AC units are honestly easier to service in a lot of cases than people assume, and we handle them regularly.
Yes, and it’s worth doing. Regular ac maintenance catches the small stuff before it turns into a breakdown, and it keeps most manufacturer warranties intact.
Don't Take Our Word for It — Check Out Our Reviews!
Posted on Yelp
Arun S.
Great work. Thanks Igor and thanks Chris for a professional work done. Our Air conditioning system needed work and you were spot on diagnostics and fix .
Posted on Yelp
Eric A.
Quick easy and painless. Not the cheapest, but they do quality work. I had my bathroom drain cleaned out and pipes snaked.
Posted on Yelp
Stephanie W.
We're just about to have our heat pump and new water heater installed, so I can't speak to that experience yet, but I had to say how helpful their sales rep, Jeff, was with all of my questions to get settled into a plan. I'm one of those people who like to know what's going on line by line, and his patience and knowledge was very appreciated!
Posted on Yelp
Nicasio C.
Received professional service from Fuse from the start of the project to the finish. Project completed was AC and furnace replacement to heat pump and air handler.
Posted on Yelp
Nate M.
Great price to value/service ratio. No complaints and would use their service again.
Posted on Yelp
Frank C.
I had a need to replace our 50G gas water heater. Received several quotes from various contractors. Fuse was the most cost-effective proposal. Quote included new Bradford White heater, new expansion tank (did not have one before), new gas supply line to the heater, new drain pan, new Corro-Protec powered anode to prevent corrosion, and city permit. Installation was smooth. Workmanship excellent. Passed inspection with no issues.
Posted on Yelp
Han Wook C.
Henry and Alex did a fantastic job installing our new heat pump system! They worked hard over two days to get everything set up perfectly. They were punctual, professional, respectful of our home, and extremely knowledgeable. The new system is running great. Huge thanks to Henry and Alex for their hard work--I definitely recommend this team for your HVAC needs!
Posted on Yelp
Matt B.
Update: In what I am pretty convinced was a total coincidence, shortly after the heat pump was installed our gas hot water heater stopped working. I couldn't find anything that the installer would have done to cause it since the symptom was that the gas flame would not stay on. I called Fuse to see what they had to say and within a hour two technicians came out to take a look. After a couple hours of troubleshooting they thought it might be the control board. Of note they didn't charge us for their time. The gas HWH was to be replaced by Fuse with a heat pump based HWH so it seemed silly to invest much effort. Unfortunately there wasn't one of their electricians available for a couple of weeks to install the needed sub-panel. On a follow up call to Fuse, I reminded them that we also have an EV charger in the garage that they might be able to temporarily "borrow" the circuit. The next day the team of Ronnie and Alex came out and installed the new HWH using the EV charger's circuit (having to use a public charger was a small price to pay to having hot water). Once again, a professional job with great attention to detail. Last week Zorik the electrician arrived as scheduled to complete the installation. He worked with me on where I would prefer the sub-panel be installed. Within a few hours, our EV charger was back in business. I appreciated that Zorik took the time to review what breakers were moved so that I could update my records. I was confident that the job (and the others) were all were properly compliant with the building codes. Worth noting, the technician from an independent company came out to do the duct work testing (which passed). As he was leaving the subject of Fuse came up. His comment was that they are the best in the Bay Area.
Posted on Yelp
Jahrell H.
Sergei did an excellent job installing our RO system under the sink and he fixed a leak from plumbing under our home. He is an excellent plumber.
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