Heating Repair in Sunnyvale, TX
Fast, honest, flat-rate residential furnace and heat pump repair in Sunnyvale. Diagnostic $85 (waived with repair). Licensed TACLA126718E, EPA 608 Universal certified, family-owned since 2018.
Where in Sunnyvale Do We Run Heating Repair Calls?
Our team services Sunnyvale from our Farmers Branch base — 25 miles via LBJ to I-30 East, roughly 40 minutes. We cover 75182 including Town Center, Tripp Road, Long Creek, Scenic Drive, Stodghill Road, and Belt Line corridor. Sunnyvale sits in Dallas County.
Now serving Sunnyvale
Sunnyvale is about 40 minutes from our Farmers Branch shop via LBJ and I-30. Same-day response during 95°F+ weather is routine. We carry Manual J load-calc software for the chronic oversizing diagnosis on Tripp Road and Long Creek customs, plus extended electronic leak detection equipment for the 60-100 ft long line sets standard on acre-lot installs.
Sunnyvale heating load context
Sunnyvale is a rare Dallas County city that codified a 1-acre minimum lot size to preserve rural character — about 7,000 people on 16 sq mi, nearly every home a single-family custom on a big lot. Housing mix is 1970s-80s original customs, 1990s-2000s upscale additions, small 2010s+ pockets. Most homes 2,500-4,500 sqft. The dominant Sunnyvale repair pattern is short cycling and humidity complaints from oversized HVAC — installers historically followed 'bigger lot = bigger system' logic and bolted 5-ton units on homes that needed 3-3.5 ton.
How Much Does Heating Repair Cost in Sunnyvale?
Furnace repair in Sunnyvale starts at $85 for the diagnostic (waived with any repair). Most common heating repairs fall in the $250-$1,300 range. We're flat-rate, which means the price quoted before we start is the price you pay at the end. Frosty Club members save 10-15% on every repair.
| Repair | Regular Price | Frosty Club Member |
|---|---|---|
| Diagnostic / service call(Waived with repair) | $85 | $72.25 |
| Furnace ignitor replacement | $400 | $340 |
| Flame sensor replacement | $400 | $340 |
| Pressure switch replacement | $250 – $550 | $212.50 – $467.50 |
| Pilot assembly replacement | $350 – $550 | $297.50 – $467.50 |
| Gas valve replacement | $400 – $1,200 | $340 – $1,020 |
| Inducer motor replacement | $500 – $1,300 | $425 – $1,105 |
| Blower motor (standard) | $750 – $1,500 | $637.50 – $1,275 |
| Blower motor (ECM) | up to $2,800 | up to $2,380 |
| Control board (universal) | $500 | $425 |
| Control board (ECM / modulating) | up to $3,500 | up to $2,975 |
| Thermostat (basic) | $350 | $297.50 |
| Thermostat (programmable) | $500 | $425 |
| Cracked heat exchanger(CO safety — never repaired) | FULL FURNACE REPLACEMENT | FULL FURNACE REPLACEMENT |
Cracked Heat Exchanger: Safety First
A cracked heat exchanger means combustion gases — including carbon monoxide — can leak into your home's air supply. We NEVER repair a cracked heat exchanger. The only safe fix is a full furnace replacement. If I find a crack during diagnostic, I red-tag the unit on the spot and show you our three replacement tiers. Learn more about CO safety at the EPA.
Save More with Frosty Club
Basic ($99/yr):10% off all services | Premium ($300/yr): 15% off + $500 repair credit + 2 free tune-ups (fall heating + spring AC)
Join Frosty ClubWhat Are the Most Common Heating Problems in Sunnyvale?
Texas winters are mild, but furnaces still need regular service — and when they fail on a 28°F January morning, they tend to fail all at once. Here's what I see most often on Sunnyvaleheating calls, and what each one typically costs to fix.
Furnace won't ignite
Failed hot-surface ignitor ($400) or coated flame sensor ($400). Both are same-day fixes. The $85 diagnostic identifies the exact cause.
Blowing cold air instead of hot
Usually a failed ignitor, bad flame sensor, or a stuck gas valve. We run a combustion analysis to confirm the exact cause before quoting.
Loud buzzing or grinding
Dying inducer motor ($500-$1,300) — the draft fan pulling combustion gases through the heat exchanger. Replace before it takes out the control board.
Short cycling (on/off/on/off)
Dirty flame sensor, failing limit switch, or restricted airflow. Can be an early warning of a heat exchanger issue — we diagnose carefully.
Gas smell or CO alarm
EMERGENCY — leave the house, call Atmos Energy at 866-322-8667, then call us. We locate the leak source and repair or red-tag as required.
Cracked heat exchanger
Carbon monoxide risk — NEVER repaired. Full furnace replacement required for safety. We confirm with combustion analyzer and bore-scope inspection.
Why Do Sunnyvale Homeowners Choose Frosty's for Heating Repair?
Sunnyvale heating calls concentrate December through February when North Texas takes its 20-30 freeze nights. Most Sunnyvale estate homes in Pheasant Creek, Long Creek Ranch, and Estates of Sunnyvale run two-stage or modulating gas furnaces tied to variable-speed blowers, and the failures we see are age-typical: hot-surface ignitors ($400) cracking after 15 years of cycling, flame sensors ($400) carboned over from years of combustion deposits, pressure switches ($250-$550) stuck closed after summer dust, and inducer motors ($500-$1,300) finally seizing after two decades.
The heat exchanger is what I take most seriously on any Sunnyvale system 15+ years old. A crack leaks CO into the supply air that circulates through every room of a 5,000 sqft estate home. We don't repair cracked heat exchangers — they can't be safely welded to factory spec. Instead we condemn the furnace and quote full replacement. Every Sunnyvale diagnostic includes a CO check at a supply register and a visual heat exchanger inspection where access allows. On dual-furnace Sunnyvale estates, we check both every time.
A subset of newer all-electric Sunnyvale builds run heat pumps with electric heat strip backup instead of gas furnaces. Heat pump winter failures look different: failed defrost boards, bad reversing valves, outdoor TXV issues, electric heat strip element failures when outdoor temps drop below 15°F. Heat pumps briefly run in cooling mode during defrost cycles to melt ice off the outdoor coil, so steam off the unit on a 25°F morning is normal. Call (469) 254-0548 for $85 diagnostic (waived with repair).
Neighborhoods we serve in Sunnyvale: Pheasant Creek, Long Creek Ranch, Estates of Sunnyvale, Hunter's Glen, Sunnyvale ISD area
Why Should I Trust Frosty's Credentials for Heating Repair?
Because a gas furnace that's repaired wrong can leak carbon monoxide. Every credential below — TACLA126718E, EPA 608 #2396328, 99 Google reviews — is independently verifiable. We red-tag cracked heat exchangers on the spot; we never patch them.
TACLA126718E
Texas HVAC Contractor License held by Mariafernanda Jacobo. Issued and regulated by the Texas Department of Licensing and Regulation.
EPA 608 Universal
Omar Jacobo, #2396328. Required by the U.S. EPA for any refrigerant work on heat pumps (R-22, R-410A, R-454B, R-32). Also ensures safe combustion analysis standards.
Energy Star Partner
Replacement heating systems meet or exceed U.S. Department of Energy minimums. 90%+ AFUE furnaces and ENERGY STAR heat pumps qualify for some utility rebates.
Learn more about our credentials on our About page or visit omar-jacobo.com.
Related Services in Sunnyvale
Frosty's covers every residential HVAC need in Sunnyvale, TX — one phone line, one flat-rate pricing book, one licensed (TACLA126718E) family-owned team.
- AC Repair in Sunnyvale/ac-repair-sunnyvale-tx
- AC Replacement in Sunnyvale/ac-replacement-sunnyvale-tx
- Heating Replacement in Sunnyvale/heating-replacement-sunnyvale-tx
- Ductwork in Sunnyvale/ductwork-sunnyvale-tx
- Emergency HVAC in Sunnyvale/emergency-hvac-sunnyvale-tx
- Tune-Up in Sunnyvale/tune-up-maintenance-sunnyvale-tx
Nearby Cities We Also Serve
Same flat-rate heating repairpricing across every city we cover. If you're in a Sunnyvale-adjacent neighborhood, these pages have local details for your ZIP.
- Heating Repair in Mesquite/heating-repair-mesquite-tx
- Heating Repair in Garland/heating-repair-garland-tx
- Heating Repair in Balch Springs/heating-repair-balch-springs-tx
- Heating Repair in Rowlett/heating-repair-rowlett-tx
- Heating Repair in Dallas/heating-repair-dallas-tx
- Heating Repair in Sachse/heating-repair-sachse-tx
From Our Blog
Deeper context on heating repair written by Omar Jacobo (EPA 608 #2396328).
- 5 Signs Your Furnace Needs Repair (Before Winter Hits)5 warning signs your furnace needs repair — with exact DFW repair costs. Never repair a cracked heat exchanger. Call (469) 254-0548.Read article →
- Ductwork Problems? How Bad Ducts Cost You MoneyLeaky, damaged ductwork wastes 20-30% of your cooled air. Learn the signs, repair costs, and when to replace. DFW homes. Call (469) 254-0548…Read article →
- Flower Mound HVAC: Why Your Upstairs Won't Cool DownFlower Mound homeowners: why your upstairs is hot, what it costs to fix, and when to replace. Larger homes need special attention. Call (469…Read article →
What Do Sunnyvale Homeowners Ask About Heating Repair?
How much does furnace repair cost in Sunnyvale, TX?
Diagnostic $85 flat (waived with repair). Common Sunnyvale furnace repairs: hot-surface ignitor $400 ($340 for Frosty Club members), flame sensor $400 ($340), gas valve $400-$1,200 ($340-$1,020), inducer motor $500-$1,300 ($425-$1,105), pressure switch $250-$550. Flat-rate — you see the total before we start.
Is my Sunnyvale furnace safe with a cracked heat exchanger?
No. A cracked heat exchanger leaks combustion gases — including carbon monoxide — into your supply air, which circulates through every room. We don't repair cracked heat exchangers because they can't be safely welded to factory spec. Instead, we condemn the furnace and quote full replacement. Every Sunnyvale diagnostic on a 15+ year old system includes a heat exchanger inspection and CO check.
Do you repair heat pumps in Sunnyvale?
Yes. A subset of newer all-electric Sunnyvale builds use heat pumps with electric heat strip backup. Common failures include defrost board faults, failed reversing valves, outdoor TXV issues, and electric heat strip element failures. We service Carrier, Trane, Goodman, Lennox, Rheem, and all major residential brands.
My Sunnyvale furnace keeps shutting off after a few minutes — why?
Short cycling on a furnace usually means a dirty flame sensor (most common — $400 flat to clean/replace), overheating from restricted airflow, or a failing pressure switch. The $85 diagnostic identifies the cause. On big Sunnyvale estates with 20+ supply registers, clogged filters on the zoning side are an overlooked suspect.
Cold snap hit Sunnyvale and my heat died — how fast can you come out?
During hard freezes we prioritize no-heat calls. Business-hours response is typically within 2 hours for 75182 Sunnyvale addresses; Frosty Club Premium members get same-hour response when available. After-hours emergency diagnostic is $250 for non-members, $212.50 for Basic members, $85 for Premium members. Call (469) 254-0548.
Can You Still Service Older R-22 Heat Pumps in Sunnyvale?
Yes — EPA 608 Universal cert #2396328 lets me legally recover, recycle, and recharge R-22 under federal regulations. R-22 production ended in 2020 under the Clean Air Act phase-out (EPA.gov), so it now runs $200 per pound installed. A typical Pheasant Creek and Long Creek Ranch R-22 leak repair totals $650-$1,000: electronic leak detection ($250) or nitrogen leak test ($500) plus recharge at $200/lb. Optional leak seal $350 — but it can void manufacturer warranties, so I only recommend it in specific cases. For systems past 12 years with major leaks, planning the transition to R-454B or R-32 is usually the better economics. Read our R-410A phase-out explainer for DFW homeowners.
Can You Repair My R-410A Heat Pump in Pheasant Creek and Long Creek Ranch?
Yes — heat pumps and ACs use the same refrigerant rules. EPA 608 Universal cert #2396328 covers R-410A heat pump service. AIM Act 2025 phase-out (Energy.gov) only stops new equipment manufacture — existing Pheasant Creek and Long Creek Ranch heat pumps stay serviceable. Repair cost runs the same as AC: $250-$500 for leak detection plus $100/lb recharge. Repair is usually right unless the system is past 12 years old. Read our R-410A phase-out explainer for DFW homeowners.
How Do I Schedule Emergency Heating Repair in Sunnyvale?
Call us or request service online. Same-day appointments available for Sunnyvale homeowners during winter cold snaps. Flat-rate pricing — no surprises, no hourly charges, no upsell scripts.
Written by Omar Jacobo, EPA 608 Universal Certified Lead Technician at Frosty's HVAC LLC. Licensed TACLA126718E.
Written by
By Omar Jacobo
Texas Licensed HVAC Contractor #TACLA126718E · EPA #2396328
Co-Owner of Frosty's HVAC LLC, serving DFW since 2018. Learn more
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