Furnace Repair in San Antonio, Texas
Furnace repair in San Antonio starts near $130 for a simple fix and can reach $550 for after-hours calls or major parts. A typical bill is closer to $360.
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San Antonio Weather and HVAC Load
In a normal year, San Antonio racks up 1,527 heating and 2,994 cooling degree days (NOAA 1991-2020 normals). Cooling carries most of the load. Heating equipment gets light use, so a furnace here often outlasts the AC it's paired with. On average, San Antonio gets 22 freezing nights and 112 days above 90°F per year. For a 2,000 sq ft house, this climate points to a heating load somewhere near 35,000 BTU/h. Treat that as a starting number. A Manual J calculation will move it up or down based on insulation and windows.
| Heating degree days / year | 1,527 |
|---|---|
| Cooling degree days / year | 2,994 |
| Nights at or below 32°F | 22 |
| Days above 90°F | 112 |
| Average low / high | 58.1°F / 79.8°F |
San Antonio Housing Stock
Half the homes in San Antonio were built before 1984 (Census ACS median), so the typical house is about 42 years old. A lot of these homes are on their second or third system by now. The ductwork is usually original, and leaky joints are common. Owners live in 52.4% of occupied homes, roughly 287,000 households. With a median household income of $62,917 and a median home value of $219,700, local labor rates come out near the national middle in our model.
NOAA storm reports for Bexar County show 35 hail days and 24 days with damaging thunderstorm winds over the six years from 2020 to 2025. The largest hail reported was 5.5 inches across. Hail flattens the thin aluminum fins on condenser coils and cuts airflow. After a big storm, take a look at the outdoor unit; homeowners insurance often covers the damage. Bexar County also had 2 tornado days in that period.
Symptoms Worth a Service Call
- A yellow or flickering flame instead of a steady blue one
- The blower won't stop running
- The thermostat calls for heat and nothing happens
- Cold air coming out of the vents
- Banging, squealing or rattling from the furnace
What Moves the Price
- The diagnostic or service call fee
- Which part failed: a flame sensor costs far less than a control board or blower motor
- The furnace's age and brand, which affect parts availability
- Whether the part is still under the manufacturer warranty
- Night, weekend or holiday rates
We lowered the national figures about 15% for San Antonio using local income, home values and the equipment size this climate needs. Real bids can still come in outside the range, so collect three written quotes.
What the Quote Should Cover
- Replacing the part that failed
- A safety and combustion check
- A diagnostic check
- A test run through a full heating cycle
Texas Licensing and Efficiency Rules
Texas is in the DOE's Southeast region, where new split central air conditioners need at least 14.3 SEER2 (13.8 SEER2 for systems of 45,000 BTU/h and up). A repair usually goes ahead without a permit, but the tech handling refrigerant must hold EPA 608 certification. Ask the company for its Texas license or registration number before the visit.
Before You Hire
- Ask whether the diagnostic fee comes off the repair bill.
- If the furnace is past 15, ask the tech to price both a repair and a replacement.
- Check the filter, the thermostat batteries and the breaker first. Those three cause a surprising number of no-heat calls.
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Furnace Repair Questions from San Antonio Homeowners
What does furnace repair cost in San Antonio?
Most bills land between $130 and $550, including the service call. A typical visit is about $360. Night and weekend calls cost more.
What is the most common furnace repair?
Cleaning a dirty flame sensor or replacing a cracked hot-surface ignitor. They're also two of the cheapest repairs.
Should I repair or replace my furnace?
Here's a rule many techs use: multiply the furnace's age by the repair quote. If the number is over $5,000, replacing it usually makes more sense.
Furnace Repair Near San Antonio
- Houston $130 to $550
- Dallas $140 to $600
- Fort Worth $140 to $610
- Austin $160 to $700
- El Paso $130 to $550
- Arlington $140 to $610
- Corpus Christi $120 to $530
- Plano $170 to $740
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station San Antonio Incarnate Word; NOAA Storm Events Database 2020-2025, Bexar County. Prices are our estimates, not contractor quotes. Updated 2026.