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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AfterFast, Reliable Furnace Repair Across San Antonio
Most furnace repairs in San Antonio run $150-$700 and are completed in a single visit, with our Furnace Repair team carrying parts for Trane, Lennox, Goodman, Rheem, and other major brands on every truck. When your furnace quits on a January morning or starts blowing cold air through your vents, you need a technician who understands what San Antonio’s hard water and brutal summer attic heat do to your system, not someone reading from a generic checklist. Call (817) 402-2972 any time, day or night. A live person answers, and we’ll give you a firm arrival window before we head your way.
We’re based in Miami with dispatch coordinated through our South Florida office, and our crews serve San Antonio homeowners directly. That local presence matters when you’re tracking a tech to a home off Rigsby Avenue or up near the Wesley Chapel line. We know the area, we stock the parts, and we don’t make you wait through a voicemail tree.
Why Coldharbour Heating & Air Is San Antonio’s Preferred Furnace Repair Company
We’ve been part of the Kingswell network since 2003, and our independently owned operation brings The Kingswell Way to every San Antonio home we enter. That means four written promises on every job: a price before the work starts, a firm arrival window, a clean job site, and our 365-Day Done Right Promise in writing. If a repair fails within a full year, we come back and fix it at no charge. No argument, no runaround.
Our technicians are background-checked, uniformed, and trained on nine major residential HVAC brands. They know San Antonio’s housing stock, the calcium-scaled drain lines that are standard here, and the attic temperatures that cook blower motors in slab-on-grade homes across the Northeast and Southeast Sides. Reviews from San Antonio customers consistently mention that we show up in the window promised and explain what’s wrong before touching a tool.
Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail trees, no “call back in the morning” when your furnace dies on a Saturday night.
Heating Repair in San Antonio
Heating Repair in San Antonio covers everything from gas furnace ignition failures to blower motor replacements and heat exchanger inspections. Because our shoulder season barely exists, most local systems flip from months of continuous AC to brief, hard heating cycles with little transition. That pattern stresses heat exchangers and capacitors in ways northern Texas contractors don’t see as often. Most heating repairs in San Antonio fall between $150-$700, with simpler fixes like ignitor replacements on the lower end and heat exchanger work toward the higher range.
Heat Exchanger Inspection and Repair
The heat exchanger is the metal chamber that separates combustion gases from the air you breathe. In San Antonio’s 1950s-1980s slab homes, attic ductwork regularly hits 150°F+ in summer, accelerating thermal fatigue. We scope every heat exchanger we suspect of cracking, and if we find a breach, we explain your repair-versus-replace options with a written price before proceeding.
Ignitor and Gas Valve Service
Modern furnaces use a hot surface ignitor rather than a standing pilot. These ceramic elements fail after 3-5 years of cycling, especially in systems that sit idle through long cooling seasons then fire hard during brief cold snaps. Most ignitor replacements in San Antonio run $150-$280, parts and labor included.
Boiler Repair in San Antonio
Boiler Repair in San Antonio is less common than furnace work, but the homes and small commercial buildings that rely on hydronic heat need technicians who understand the system’s pressure dynamics and the way Edwards Aquifer hardness affects internal components. Most boiler repairs in San Antonio fall in the same $150-$700 range, though cast-iron section replacement can exceed this if the unit is aging. We service standard gas and electric boilers, including circulating pump replacement, pressure relief valve work, and zone control repairs.
Scale and Hard Water Management
Boiler water in San Antonio carries 300-400+ mg/L calcium carbonate. That scale accumulates on heat exchanger surfaces, reducing efficiency and triggering pressure faults. During boiler service, we flush the system, check expansion tank pressure, and advise on water treatment if scale buildup is accelerating.
Circulating Pump and Zone Valve Repair
When one zone stays cold or the pump runs constantly, the issue is often a seized circulator or failed zone valve actuator. We diagnose the electrical and hydraulic sides, replace the component if needed, and verify balanced flow through all zones before we leave.
Trusted Brands We Service in San Antonio
Our technicians train on Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard, and we stock common failure parts for San Antonio customers. That means faster turnaround on Trane ignitor swaps, Lennox blower motor replacements, Goodman control board failures, and Rheem pressure switch issues. We don’t order parts from three states away and make you wait. Our trucks carry the capacitors, ignitors, and control modules that fail most often in local conditions, and if we need a specialty component, our South Florida supply chain typically has it next-day.
Common Furnace Repair Problems We See in San Antonio Homes
- Heat exchangers cracking from hard shoulder-season cycling. San Antonio thermostats flip from AC to heat with almost no transition, so furnaces sit idle for six or seven months then cycle intensely during brief cold snaps. That thermal shock finds weak spots in older exchangers.
- Blower motors and capacitors cooked by attic heat. The original ductwork in 1950s-1980s slab-on-grade homes across the Northeast and Southeast Sides runs through attics that exceed 150°F in summer. Capacitors drift out of spec, motors draw excess current, and bearings fail early.
- Condensate drain lines scaled shut with calcium carbonate. Edwards Aquifer water at 300-400+ mg/L hardness deposits scale in furnace condensate lines within a single season. Backed-up water corrodes heat exchanger lower sections and triggers pressure switches.
- Duct tape failure from sustained attic temperatures. The plenum seals and duct tape in older San Antonio homes degrade after years of 150°F+ exposure. Conditioned air escapes before reaching registers, making the furnace work harder and cycle longer.
Pricing for Furnace Repair in San Antonio, FL
| Service | Typical Range in San Antonio |
|---|---|
| Furnace Repair | $150-$700 |
| Annual Tune-Up | $80-$200 |
| AC Repair | $150-$650 |
What you actually pay depends on which part failed and how long the diagnostic takes. A straightforward ignitor replacement on a Goodman furnace runs toward the lower end. A heat exchanger inspection, combustion analysis, and multiple component replacements on a 25-year-old Lennox in a hard-to-access attic pushes higher. We hand you a written price before any work begins, and that number doesn’t change at the door. Estimates are free, and there’s no charge for us to come look. Call (817) 402-2972 to schedule.
We Also Serve Cities Near San Antonio
Our Furnace Repair in San Antonio crews also respond to calls in Wesley Chapel, Dade City, Zephyrhills, and Brooksville. The same live-answer phones, same written pricing, same 365-Day Done Right Promise apply across the entire service area.
Serving San Antonio, FL - Our Local Coverage Area
We’re based in the San Antonio 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 Furnace Repair in San Antonio
A metallic smell usually means the heat exchanger is cracked or the blower motor is overheating. In San Antonio, attic heat degradation of motor windings and capacitor drift are common culprits, but a cracked exchanger is a safety issue that requires immediate inspection. Turn the system off and call (817) 402-2972. We’ll scope the exchanger and test the motor amp draw before giving you a written repair price.
Once a year, minimum. The Edwards Aquifer’s 300-400+ mg/L calcium carbonate will scale a condensate line shut within a single cooling season. During any furnace repair or tune-up, we flush the line and check the pan as standard practice, not an upsell. Call (817) 402-2972 to schedule before heating season starts.
It could be the capacitor, but it could also be a scaled condensate switch, failed flame sensor, or duct leakage causing high static pressure. In San Antonio, we see all four regularly. We were called to a 1960s slab-on-grade home off Rigsby Avenue on the Southeast Side where a Carrier furnace was short-cycling and the homeowner reported a metallic smell from the vents. Our tech pulled the blower motor, found the run capacitor reading well below spec, and scoped the heat exchanger - the attic ductwork had been running at 150°F+ all summer, cooking the tape seals and letting conditioned air escape before it reached the registers. After replacing the capacitor, re-taping the plenum, and flushing the calcium-scaled condensate drain line, the furnace held a steady cycle and the static pressure dropped back into range. Call (817) 402-2972 for a free diagnostic.
Yes, directly. The calcium carbonate in Edwards Aquifer water scales condensate drain lines, corrodes heat exchanger lower sections where water backs up, and reduces boiler efficiency by insulating heat transfer surfaces. During any heating service in San Antonio, we check for scale accumulation and flush drain paths as part of standard practice. Call (817) 402-2972 to schedule an inspection.
Signs include short cycling, uneven temperatures between rooms, and humidity that won’t drop even when the AC runs. Many 2000s-2010s homes along Loop 1604 and the far Northwest Side were built with large footprints and high ceilings that contractors sometimes sized by rule-of-thumb rather than Manual J calculation. An oversized furnace heats the space too quickly, doesn’t run long enough to distribute air evenly, and wears out faster from excessive cycling. We measure airflow and perform load calculations if you’re considering replacement. Call (817) 402-2972 for an assessment.
Ready to get your heat back on? Call Coldharbour Heating & Air at (817) 402-2972 for a free estimate. A live person will answer, we’ll give you a firm arrival window, and you’ll get a written price before any work begins. Every repair is backed by our 365-Day Done Right Promise in writing.
Written by Victor Mancini, Owner at Coldharbour Heating & Air, serving San Antonio since 2003.