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 Marcos
Most furnace repairs in San Marcos run $150 to $700, and the majority are done same-day when you call before noon. That’s the honest range. We’re Dalton Heating & Air, and our Furnace Repair team works on Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard equipment in San Marcos every week. If your heat is out tonight, call us at (361) 306-9515. A real person answers, 24 hours a day, every day of the year. No voicemail queue, no callback window.
Our service area covers all of San Marcos, from the neighborhoods off Ranch Road 12 up to the Willow Creek area, down South of the Square, and out along Hunter Road. We know which San Marcos homes still run propane and which have switched to natural gas or all-electric heat pumps. That local knowledge changes how fast we can diagnose a problem and what parts we bring on the truck.
Why Dalton Heating & Air Is San Marcos’s Preferred Furnace Repair Company
San Marcos homeowners call us after being burned by a no-show or a price that changed at the door. That experience is common enough that we built our entire operating standard around not doing it. Marco Benitez leads our team, and since 2003 we’ve operated as a Garrison Partners company under The Garrison Standard: the price goes in writing before any work starts, every repair carries a written one-year guarantee, and if the repair fails inside that year, we return at no charge. Those are not upgrades. They’re the terms of every job.
Our technicians are background-checked and uniformed, so you know who is coming before they arrive. Dispatch and scheduling are coordinated from our metro office in Austin, but the crews who come to your door serve San Marcos directly. The 365-Day Done Right Promise means a full year of coverage on every repair, not a 30-day window. And here’s the part that actually matters when it’s 38 degrees outside and your furnace won’t fire: someone answers the phone at 2 a.m. and gets a truck rolling.
Heating Repair in San Marcos
Heating repair in San Marcos covers the full chain of what keeps a furnace or heat pump producing warm air: burners, ignitors, gas valves, blower motors, control boards, and thermostats. Homeowners in San Marcos call us most when a furnace will not fire at all, flames light and then go out, the blower runs constantly, or the system short-cycles and never reaches set temperature. Most heating repairs in San Marcos land between $150 and $700 depending on the part, and the price is written before we touch anything.
Ignitor and Gas Valve Work
A furnace that tries to fire but won’t stay lit usually has a failed ignitor or a gas valve that is not opening fully. On propane systems in older San Marcos homes, weak gas pressure from a drifting regulator produces the same symptom. We test gas pressure with a manometer before replacing parts, because swapping an ignitor on a system with weak pressure just burns the new one out.
Blower Motor and Control Board Repair
When the burners fire but rooms stay cold, the blower motor or control board is usually at fault. San Marcos humidity and fluctuating line voltage are hard on capacitors, and a weak capacitor can mimic a failed blower motor. We bench-test the motor and capacitor separately, replace only what failed, and document the repair in writing.
Boiler Repair in San Marcos
Boiler repair in San Marcos is a smaller, specialized call set, mostly for homes along the San Marcos River and the older stock around the Historic Jail area. These are often converted propane systems with cast-iron heat exchangers and circulation pumps instead of blowers. When a boiler stops heating, it is usually a failed circulator pump, a sticking zone valve, or a gas pressure regulator that has drifted out of spec. Boiler repairs in San Marcos fall in the same $150 to $700 range, but labor runs slightly higher on these calls because boilers are less common and take longer to diagnose correctly.
Zone Valves and Circulation Pumps
A boiler that fires but won’t push hot water to certain rooms points to a zone valve or circulator pump problem. We check the valve actuator first, then the pump. On older San Marcos boiler systems, we see valve bodies seized from hard water mineral buildup, especially on wells.
Heat Exchanger Inspection
Boilers and furnaces both need a heat exchanger inspection when the system is older than ten years. A cracked heat exchanger leaks carbon monoxide, and visual inspection alone can miss it. We test with a combustion analyzer during every boiler diagnostic in San Marcos, and we will tell you plainly if the unit is no longer safe to run.
Trusted Brands We Service in San Marcos
We’re factory-trained on nine major residential HVAC brands, and in San Marcos we see a steady mix of Rheem and York furnaces in newer subdivisions, plus Bryant equipment in some of the older custom homes along the river. Because our techs carry common Rheem ignitors, York control boards, and Bryant pressure switches on the truck, San Marcos customers get faster turnaround than waiting on a parts run from a distributor in Austin. If your furnace is a less common setup, we source the part same-day and schedule the return visit before we leave.
Common Furnace Repair Problems We See in San Marcos Homes
- Propane regulators drifting out of spec. San Marcos used to be rural enough that many homes along the San Marcos River and around the Historic Jail area still run propane-fired furnaces and boilers. When the gas pressure regulator drifts, burners light weak or not at all. A manometer test catches this before a control board gets blamed and replaced for nothing.
- Blower capacitor failures from humidity and line voltage swings. The San Marcos area’s high humidity and fluctuating utility voltage are hard on capacitors. A weak capacitor makes the blower spin slow, which mimics a bad motor. We test the capacitor before recommending a motor replacement, and it saves San Marcos homeowners real money.
- Heat exchanger cracks in older, under-insulated homes. Furnaces serving San Marcos’s older housing stock run long cycles during cold snaps, and that thermal stress cracks heat exchangers over time. This is a carbon monoxide risk. We test with a combustion analyzer on every furnace diagnostic and will tell you directly if the unit is unsafe.
- Short-cycling caused by oversized furnaces. San Marcos winters are mild most days, which means an oversized furnace short-cycles: it fires, shuts off, fires again. That wears ignitors and control boards fast. If your furnace is the wrong size for the home, we will tell you that too, instead of just replacing parts on a system that will keep failing.
Pricing for Furnace Repair in San Marcos, TX
Here is the straight answer on what furnace repair in San Marcos costs. A typical repair lands between $150 and $700, and the spread is driven almost entirely by which part failed. An ignitor replacement runs $150 to $300. A gas valve runs $250 to $500. A blower motor runs $300 to $650. A control board runs $350 to $700. The diagnostic is included when you approve the repair, and the price you approve is the price you pay. No overtime charge for night or weekend calls in San Marcos.
| Service | San Marcos Price Range |
|---|---|
| Furnace Repair | $150 – $700 |
| Heating Repair | $150 – $700 |
| Boiler Repair | $150 – $700 |
| Tune-Up | $80 – $200 |
Call (361) 306-9515 for a free estimate on any furnace repair in San Marcos. The price is in writing before any work begins, every time, without exception.
We Also Serve Cities Near San Marcos
Our crews serve San Marcos and the surrounding communities, including Kyle, New Braunfels, Wimberley, and Buda. Homeowners across the area get the same written pricing, the same one-year written guarantee, and the same 24/7 live phone answer. See our San Marcos coverage page for more on response times and neighborhoods we work in daily.
Serving San Marcos, TX - Our Local Coverage Area
We’re based in the San Marcos 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 Marcos
Yes. San Marcos’s humid subtropical climate and mild winters mean furnaces run short cycles most of the season, then get hit with brief cold snaps like the February freezes that catch equipment off guard. Short cycling wears ignitors and control boards faster, and the humidity is hard on electrical components like capacitors. Our diagnostics in San Marcos account for that pattern instead of treating every no-heat call like a generic ignition failure. Call (361) 306-9515 and we will test before we replace.
Replace when the heat exchanger is cracked, the repair cost exceeds about 40 percent of a new unit, or the system is over 15 years old and losing multiple parts in a season. Repair when it is a single failed component on a furnace under 12 years old with a clean heat exchanger. We give every San Marcos homeowner an honest repair-versus-replace write-up before we start work, and we do not sell replacements on systems that still have years left. That is part of The Garrison Code.
A proper Manual J load calculation tells us the actual heating load of your San Marcos home based on square footage, insulation, window area, and orientation. If your furnace is oversized, which we see often in San Marcos tract homes built for a generic Texas climate, it short-cycles and wears parts prematurely. We can tell you during a repair whether your system is sized right, and if you ever replace it, we use the load calculation to get the capacity correct. That one number changes how long your next furnace lasts.
Most furnace repairs in San Marcos run $150 to $700. Ignitors and flame sensors are at the low end, blower motors and gas valves in the middle, and control boards at the high end. The diagnostic is included when you approve the quoted repair. We never charge overtime for nights or weekends, and the price is in writing before we touch the system. Call (361) 306-9515 for an exact quote.
SEER2 is the updated efficiency rating for cooling, and on heat pumps it is paired with HSPF2 for heating. In San Marcos, where you run cooling far more than heating, a higher SEER2 rating matters more on the summer electric bill than the winter gas bill. If your furnace is paired with an older AC and you plan to replace both, we run the numbers on a SEER2 upgrade in straight dollar terms, not sales language. We will tell you what it actually saves per month based on your usage.
If your furnace is not heating right in San Marcos, call Dalton Heating & Air at (361) 306-9515. You will get a straight answer, a written price, and a repair guaranteed in writing for a full year. If it fails in that time, we return at no charge. That is the standard, not the exception.
Written by Marco Benitez, Owner at Dalton Heating & Air, serving San Marcos, TX.