Furnace Repair in San Antonio - On-Site Today, Diagnosis First

Trusted Furnace Repair for San Antonio Homeowners

Furnace Repair in San Antonio typically costs $150 – $700 depending on the part, the furnace’s age, and how quickly the problem is caught. Most repairs take a technician two to three hours from arrival to a warm house. At Brandt HVAC Co San Antonio, we’ve been fixing furnaces since 2003, and every job starts with a written price before any work begins.

Call (361) 470-8872

When your heat cuts out on a 38-degree December night in Alamo Heights, you need someone who answers the phone and shows up when they said they would. Call us at (361) 470-8872. A live person answers, 24 hours a day, seven days a week. No voicemail, no phone tree, no waiting for a callback. We tell you who’s coming by name and photo before they arrive, and that technician shows a photo ID badge at your door. Devin Marlowe leads our team, and he holds every tech to the Threshold Verified standard that Brandt HVAC is built on.

Key Takeaways:

• Furnace repair in San Antonio runs $150 – $700 for most common failures.
• We answer the phone 24/7 with a live person, nights and weekends included.
• You get a written price before any work starts, with no exceptions.
• Every repair includes a written guarantee, backed by the 365-Day Done Right Promise.
• Our techs are background-checked and identity-verified, and you’ll know their name and face before they knock.

Furnace Maintenance

Furnace Maintenance is a preventive service that catches small problems before they become middle-of-the-night breakdowns, and in San Antonio it typically runs $80 – $200 for a full tune-up. A furnace that hasn’t been serviced in two or three years is running less efficiently than it should, and that inefficiency shows up as higher gas bills and extra wear on the parts that are most expensive to replace. During a maintenance visit, a Brandt HVAC Co San Antonio technician inspects your heat exchanger for cracks, tests the ignition, checks gas pressure, cleans the flame sensor and burners, measures the temperature rise across the furnace, and lubricates the blower motor. Then we hand you a written report of what we found, what we fixed, and what might need attention down the road. Our technicians are not paid on what they sell, so the report is honest, not a sales pitch.

What Gets Checked

We inspect the heat exchanger for cracks or corrosion, test the limit switch and flame rollout safety, check the gas valve and burner alignment, and measure carbon monoxide output. These aren’t optional checks. A cracked heat exchanger can push carbon monoxide into your home, and that’s a hard stop on any furnace we see. We also check for the subtle things that most homeowners never notice: rust around the inducer motor, a blower wheel out of balance, a flue pipe that’s drifted out of place.

When to Schedule

San Antonio’s heating season is short but real, and the smart time to schedule is late September or early October, before the first cold front. That way your furnace has been checked and warmed up before you actually need it every night. If you missed that window, do it now anyway. The cost is small compared to the repair bill a neglected furnace will eventually hand you. Call (361) 470-8872 to book a furnace maintenance visit.

Heat Pump Repair

Heat Pump Repair is a specialty call that most San Antonio HVAC companies handle badly, because a heat pump is both a heater and an air conditioner in one, and diagnosing it wrong means you pay for a fix that doesn’t stick. That’s why our repair pricing straddles the same $150 – $700 range as furnace work but demands a different diagnostic approach. A competent heat pump diagnosis starts at the thermostat and works through the reversing valve, the defrost board, the compressor contactor, the capacitor, and the refrigerant charge. At Brandt HVAC Co San Antonio, we service every major brand, from Rheem to Carrier to Daikin, and our technicians are trained on the particular failure patterns of each. We give you a written price before any work starts.

Common Failure Points

The reversing valve is the most commonly misdiagnosed part on a heat pump. When it sticks, your system heats when it should cool or cools when it should heat, and a less experienced tech will sell you a compressor instead. We also see a lot of failed defrost boards, which cause the outdoor coil to ice up in San Antonio’s occasional winter freezes, and bad capacitors, which keep the compressor from starting. A proper diagnosis narrows the fault before a single part gets ordered.

Cold Weather Urgency

When a heat pump fails in heating mode, homeowners sometimes don’t notice it at first because the backup electric strips kick in. Then the electric bill arrives and it’s three times normal. If your system runs constantly, blows lukewarm air, or the outdoor unit is covered in ice, call us at (361) 470-8872. That’s a repair, not a tune-up, and ignoring it costs real money in electricity.

Heating Repair

Heating Repair in San Antonio covers the full range of systems that keep a home warm, including furnaces, heat pumps, and the occasional dual-fuel setup, with most jobs landing between $150 and $700. The heating system that worked fine in February can fail the first time you fire it up in November, and that first cold snap is when the majority of calls come in. Our technicians are trained across gas and electric systems, so when the issue is with the ignition sequence or the blower motor or the limit switch, we find it fast and explain it in plain language. We name the part that failed, show you the cost, and get your written approval before we touch a single component.

The First Cold Snap Load

San Antonio’s first serious cold front each year brings a wave of overheating blower motors, dirty flame sensors, and inducer motors that have seized from months of disuse. What’s striking is how many of these failures are preventable with an $80 – $200 annual checkup. The units that get maintained reliably are the ones that start when the temperature drops. Ours is straightforward: we’ll tell you what’s wrong, what it costs to fix, and what you can do to avoid seeing us again until the next maintenance visit.

Straight Talk on Parts

Some heating repairs are so common that a homeowner should know the numbers. An igniter replacement typically runs $150 – $300 parts and labor included. A flame sensor cleaning or replacement usually falls in the $100 – $250 range. A blower motor replacement can hit $400 – $700. Those are San Antonio market prices, and when you work with Brandt HVAC Co San Antonio, you’ll see the same numbers in writing before we start.

Boiler Repair

Boiler Repair is a rarer specialty in San Antonio, given how many homes use forced-air gas furnaces, but there are still plenty of older homes in Alamo Heights and Terrell Hills with hydronic systems, and they need a technician who actually understands boiler controls. For homes with forced-air systems, we also offer Furnace Repair in Schertz. We price boiler repairs in the same $150 – $700 range as other residential heating work, but the isolation is different: a boiler problem is usually a circulator pump, an aquastat, an expansion tank, a pressure relief valve, or an air-bound line. A tech who only knows forced-air systems will guess. We don’t guess.

What We Check

The first thing our technicians check on a no-heat boiler call is system pressure. Too low means a leak or a failed fill valve. Too high means a bad expansion tank. Then we test the aquastat settings, which control water temperature and are frequently the culprit when radiators are lukewarm at the far end of the house. If the circulator pump has failed, it’s an easy diagnosis: the boiler fires, the water gets hot, but it never moves. We explain all of this before quoting the repair.

Boiler Safety

Boilers work under pressure and heat, and a malfunctioning pressure relief valve or a leaking heat exchanger is not something to ignore. If you see water pooled around the base of the boiler or hear a banging sound from inside, shut the unit off and call a professional. Call (361) 470-8872 and a trained technician will come out, identify the fault, and give you a written price.

Gas Furnace Repair

Gas Furnace Repair is the most common heating call we handle in San Antonio, and our Furnace Repair in Cibolo covers the same work at the same $150 to $700 range for parts and labor. The most frequent problems are simple: a dirty flame sensor, a failed igniter, a tripped high-limit switch, or a clogged condensate drain on a high-efficiency unit. Less common but more serious is a cracked heat exchanger, which we will not patch, bend, or otherwise make do. A cracked heat exchanger is a replacement, full stop, because carbon monoxide is not negotiable.

Ignition and Burner Work

Modern gas furnaces use either a hot surface igniter or a direct spark system. Igniters fail with no warning, which is why a furnace will work one morning and fail the next. The replacement is straightforward and usually lands in the $150 – $300 range. Burner issues show up as yellow flame, soot buildup, or a gas smell when the unit fires, and those are jobs our technicians address with a combustion analysis, not a quick spark check. We want the furnace burning clean and complete.

Gas Safety

Natural gas furnaces are safe when properly maintained, and dangerous when ignored. A gas smell is an emergency, and so is a furnace that trips the rollout switch repeatedly. If your detector goes off or you smell mercaptan (the rotten-egg odor added to natural gas), leave the house and call your utility emergency line, then call us at (361) 470-8872. Do not flip light switches or use a phone inside until you’re clear of the building.

Furnace Tune Up

Furnace Tune Up is the annual service that keeps a gas furnace safe, efficient, and reliable, and in San Antonio a full tune-up costs $80 – $200 at Brandt HVAC Co San Antonio. This is not a quick-change-the-filter-and-go visit. A real tune-up takes about an hour to 90 minutes and covers the heat exchanger, burners, ignition, gas pressure, safety switches, blower motor, flue, and thermostat calibration. We also measure carbon monoxide levels during operation, which is the single most important safety check on a gas furnace. You get a written report afterwards, spelling out what was done and what we saw.

The 21-Point Inspection

Our tune-up follows a 21-point checklist that covers every system on the furnace. We check gas line connections for leaks, test amp draw on the blower motor, inspect the inducer assembly for bearing wear, confirm proper airflow across the evaporator coil, and verify the heat exchanger is intact. No student tech runs this list alone; an experienced technician signs off on every line. If we find something that needs attention, we’ll tell you the cost and let you decide.

Saving Money With Tune-Ups

A well-tuned furnace uses measurably less gas, sometimes 5 to 10 percent less, and a clean blower motor lasts years longer than one that’s been running with a dirty filter and restricted airflow. The $80 – $200 you spend on maintenance each fall is insurance against a $700 repair in January. And here’s the honest math: most of the emergency calls we run in cold weather are from furnaces that haven’t been serviced in years. Call (361) 470-8872 to schedule your furnace tune up.

Emergency Furnace Repair

Emergency Furnace Repair in San Antonio means a live person answers your call at 2 a.m., a technician is dispatched immediately, and you’re not paying double for the privilege. Our pricing stays in the same $150 – $700 range whether it’s Tuesday afternoon or Saturday night. When the temperature drops into the 30s and your furnace is dead, that’s not an inconvenience; that’s a risk to your pipes, your family’s comfort, and your home. We treat it with that seriousness and no overtime surcharge.

24/7 Live Dispatch

This is the part that sets Brandt HVAC Co San Antonio apart. Our phones are answered by a real person around the clock, every single day of the year, holidays included. No callback queue, no “leave a message and we’ll get back to you during business hours.” You call, you talk to a human, and a technician is sent to your house. Nights and weekends don’t change the price of the repair itself.

Who’s at Your Door

We know emergency calls happen when people feel most vulnerable. That’s why the technician who arrives at 3 a.m. is the same person whose name and photo you received before they left our shop. They’re background-checked, identity-verified, and in uniform with a photo ID badge they’ll show you before stepping inside. If someone arrives who you were not told to expect, that visit is on us and we make it right. That’s the Threshold Verified standard, and it applies to every call, emergency or not.

Brands We Service

Our technicians work on every major residential heating brand, and we stock OEM parts for Rheem, York, Daikin, Bryant, and the others our San Antonio customers call about most. A Rheem furnace has its own ignition sequence and control board logic, and knowing those details means a faster diagnosis and a correct fix the first time. We’ve seen thousands of Rheem units across the city, from Castle Hills to Windcrest, and our parts bins reflect that familiarity.

York and Daikin systems have their own failure patterns too, and Bryant’s high-efficiency models use a condensate system that needs proper servicing. The point is this: a furnace that gets misdiagnosed costs you more than the repair should have. Whether you have a Goodman, a Trane, a Lennox, or a Carrier, or any other make we haven’t named here, our technicians know the system. If we can’t fix it accurately, we’ll say so, and we’ll help you figure out what comes next.

Signs You Need a Pro Right Now

• Your furnace is blowing cold air. A furnace that runs but pushes cold air often means the burners aren’t lighting, the gas valve is stuck, or the flame sensor has failed. It’s a repairable problem, but every cold cycle wastes gas and strains the blower. A technician can diagnose this in under an hour.
• You smell gas or a metallic odor. Natural gas in your home is an emergency, full stop. A metallic smell when the furnace runs can indicate overheating components or a failing heat exchanger. Call your utility emergency line first if you smell gas, then call us at (361) 470-8872 once you’re safely outside.
• Your furnace turns on and off repeatedly. Short cycling like this is usually a clogged filter, a failing thermostat, or an overheating heat exchanger. Each cycle adds wear to the ignition and blower, and the problem compounds quickly. Ignoring it for a week can turn a $150 fix into a $500 repair.
• You hear banging, rattling, or high-pitched squealing. A bang when the furnace starts suggests delayed ignition, which can be dangerous and should be checked immediately. A rattle might be a loose blower wheel or a failing inducer. A squeal is almost always a blower motor bearing, and it fails soon after the noise starts. All of these are cheaper to fix before the part gives out entirely.
• Your gas bill jumped with no explanation. A furnace that’s suddenly burning more gas than last winter is telling you something: clogged burners, a misaligned gas valve, or a heat exchanger that’s losing heat out the flue. The best case is a simple fix. The worst case means carbon monoxide is leaking into your home, which is why we test for it on every call.

Our Process, Step by Step

1. 1
   You call and talk to a person. A live dispatcher answers at (361) 470-8872, day or night. You describe the problem in your own words. If it’s an emergency, a technician is dispatched immediately. You’ll get the tech’s name and photo before they arrive.
2. 2
   We introduce ourselves at the door. The technician arrives in uniform, shows a photo ID badge, and confirms their identity against the name and photo you were already sent. This is the Threshold Verified standard at work. No mystery, no surprise, just the person you were told to expect.
3. 3
   We diagnose and give you a written price. The technician inspects the furnace, identifies the failure, and writes down exactly what needs to be done and what it will cost. No work starts until you see that number and agree to it in writing. If the fix is simple, the price will reflect that. We don’t pad small jobs into big ones.
4. 4
   We complete the repair and test the system. The part gets replaced with OEM or equivalent quality. Then the furnace is cycled through a full heating sequence, combustion is checked, and carbon monoxide levels are measured. The technician walks you through what was done and why.
5. 5
   You get a written guarantee. Every repair comes with a written guarantee covering the parts and labor. If the repair fails within the guarantee period, we return and fix it at no additional charge, no argument. That’s our 365-Day Done Right Promise, and it’s the reason our customers stay customers.

How Much Does Furnace Repair Cost in San Antonio?

Our Service Area Near San Antonio

We serve homeowners across the San Antonio metro, from home base in the city proper out to Schertz, Cibolo, Boerne, Kirby, Floresville, Windcrest, Bulverde, Alamo Heights, Terrell Hills, Castle Hills, and Lackland AFB. Typical response time within San Antonio is one to two hours for emergency calls. For homeowners in Furnace Repair in Schertz or Furnace Repair in Cibolo, we’re usually on site within 90 minutes. This page covers Furnace Repair in San Antonio specifically, and you’ll find the same pricing and guarantees wherever our trucks roll.

Frequently Asked Questions About Furnace Repair in San Antonio

Schedule Your Furnace Repair Service in San Antonio Today

If your furnace is struggling, don’t wait for the next cold snap to finish what this one started. Call Brandt HVAC Co San Antonio at (361) 470-8872 and get a free, no-obligation estimate. A live person answers around the clock. We’ll send a background-checked, identity-verified technician whose name and photo you’ll know before they arrive. Written price first, written guarantee on every repair. That’s how we’ve done it since 2003, and that’s how we’ll do it for you.

Written by Devin Marlowe, Owner at Brandt HVAC Co San Antonio, serving San Antonio homeowners since 2003.