Furnace & heating
AC repair
Heat pumps
Ductless mini splits
Carrier
TraneSeasonal 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, TX
Sunnyvale sits just east of Dallas, and its homes don’t all age the same way. A house built in 1978 with original ductwork needs something different from a brand-new custom home with a dual-zone system, even if both lose cooling on the same 102° afternoon. We’re Coldharbour Heating & Air, an independently owned and operated member of the Kingswell network, and our technicians work on both ends of that spectrum. What ties every Sunnyvale job together is the heat, the humidity, and the storms that roll through fast and leave condensers blinking. Call (430) 213-5796 when your system gives out, and a live person answers, day or night.
Why Sunnyvale Homes Are Different
Sunnyvale’s housing stock splits into two rough groups. The older ranch-style homes from the 1970s and 80s often have slab foundations, original ductwork, and undersized return air openings that make the AC work harder than it should. The newer subdivisions have large custom homes with dual-zone systems and variable-speed equipment, but those systems live in attics where summer heat pushes past 130° inside the decking. Both kinds of homes share the same Texas conditions: long stretches above 100°F, humidity that never really breaks, and severe thunderstorms with hail that dents coils and knocks out power. After a summer brownout, we replace capacitors in five-year-old systems and twenty-year-old systems alike. The age of the equipment matters less in Sunnyvale than the stress it’s been under.
Styles & brands we work with
Our Main Sunnyvale Services
The two calls we get most from Sunnyvale homeowners are for cooling that quit during a heat wave and heat that won’t fire on the first cold morning. The pages below cover each service in detail, with local pricing and what to expect from the first visit.
AC Repair in Sunnyvale
When your AC stops cooling on a 100° day, the most common culprits in Sunnyvale are failed capacitors, refrigerant leaks at the coil, and hail-damaged condenser fins. We diagnose the problem, hand you a written price before any work begins, and most repairs are completed the same visit. The 365-Day Done Right Promise covers every repair in writing: if it fails within a year, we return and correct it at no charge. Read more about AC Repair in Sunnyvale.
Furnace Repair in Sunnyvale
Sunnyvale winters are mild but the cold snaps are real, and when your furnace won’t light, you don’t want to wait until Monday for a callback. Our technicians service gas and electric furnaces and are trained on nine major residential brands. We check the igniter, limit switch, and gas valve, then give you a written quote before touching a tool. Every furnace repair carries the same 365-day written guarantee. Learn more about Furnace Repair in Sunnyvale.
AC Installation in Sunnyvale
Installing a new AC in Sunnyvale means matching the system to the house, not the driveway. A 1980s ranch with slab ducts and a single return needs different airflow planning than a new dual-zone custom. We size the equipment, give you a written fixed price before any work starts, and schedule a set install date. We handle the paperwork and can walk you through rebate options. Details are on the AC Installation in Sunnyvale page.
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
We service Carrier, Trane, American Standard, Bryant, and other major residential brands. Our trucks carry common capacitors, contactors, and igniters so most Sunnyvale repairs finish in one stop. See our brands for the full list and what each one needs for maintenance.
See the difference
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After
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AfterPricing for HVAC Company in Sunnyvale, TX
| Service | Typical range in Sunnyvale |
|---|---|
| AC repair (most common fixes) | $150 – $650 |
| Furnace repair (most common fixes) | $150 – $700 |
| AC installation (full system, depending on size) | $3,500 – $7,500 |
| Tune-up (single system) | $80 – $200 |
Two things push prices higher in Sunnyvale: hail damage to coils and refrigerant leaks that have run low enough to stress the compressor. Those jobs cost more because they involve more labor and, for refrigerant, material. Whatever the job, you get the written price handed to you before any work begins, and that price doesn’t change at the door. That’s the Kingswell Way.
Neighborhoods We Serve in Sunnyvale
We work across the whole town, from the original ranch homes off Collins Road to the newer subdivisions east of Town East Boulevard. Sunnyvale is compact, so our response is typically same-day for cooling and heating emergencies.
- Old Town Sunnyvale
- The Reserve at Sunnyvale
- Sunnyvale Estates
- Emerald Meadows
- Areas around Town East Boulevard
Service Area – Cities Near Sunnyvale
Our technicians also cover the cities around Sunnyvale when neighbors need help. We’re in Dallas, TX regularly, along with Sachse, TX to the north. Irving, TX and Addison, TX are in our service area too, with dispatch and scheduling coordinated from our Dallas-Fort Worth office.
Serving Sunnyvale, TX - 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 serve Sunnyvale locally and are typically on site the same day for AC or furnace emergencies. When you call (430) 213-5796, a live person answers around the clock, every day of the year, and gives you a firm arrival window.
Some Sunnyvale subdivisions require approval before visible equipment changes, like a new condenser or heat pump. We’ll flag that during the estimate and can provide whatever documentation your HOA asks for. Inside your home, no approval is needed.
We schedule tune-ups year-round, though spring and fall are the best windows before the extreme heat or the first freeze. A tune-up runs $80 – $200 depending on your system, and you get a written report of what was checked and what needs attention.
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
"Furnace wouldn't light the first cold morning. The guy walked me through what he was checking so I actually understood it. Replaced the igniter, wrote up the warranty, and it's been warm since."
- Alicia Romero"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"Replaced our old system. Good crew and a fair price. The install took most of a day which was longer than I expected, but they didn't cut corners and cleaned up everything."
- Kenny Barlow