Cities We Serve
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Furnace Services in Austin & San Antonio
Heat You Can Count On When the Front Rolls In
Furnace repair, tune-ups and replacement for homes across Austin, San Antonio and the Hill Country. Licensed technicians who work on gas and electric heat, with the price in writing before anything starts.
A Furnace in Central Texas Sits Idle for Months, Then Has to Work
Most furnaces in Austin and San Antonio run a few weeks a year, and that is exactly the problem. From March to November the burners, igniter and flame sensor sit in a hot attic collecting dust. Then the first real cold front arrives, every thermostat in the region calls for heat on the same night, and the parts that were quietly corroding all summer are asked to light on the first try. A lot of them do not.
Radiant handles the whole heating side of your system. Furnace repair when it will not light, keeps shutting off or blows cold air. A fall furnace tune-up that cleans the flame sensor, tests the safety controls and checks the heat exchanger before you need it. And when the equipment is done, a properly sized furnace replacement with an honest look at whether a heat pump would serve the house better.
Gas furnace, electric furnace or an air handler with heat strips: our technicians work on all of them, in Austin and San Antonio, backed by the Home Comfort Guarantee.
Looking for your local team? See heating service in Austin or heating service in San Antonio.
- Gas and electric heat Gas furnaces, electric furnaces and heat-strip air handlers, in attics, closets and garages.
- The price before the work A written quote honored for 72 hours. What you approve is what you pay, on a holiday or a Tuesday.
- Care Club tune-ups Two HVAC tune-ups a year, no dispatch fees and 5% off repairs for $9.99 a month.
Furnace and Heating Services
From a flame sensor cleaning to a new furnace in the attic, and the systems that work alongside it.
- Furnace Repair Will not light, short cycles or blows cold. We find the failed part, quote it in writing and fix it, day or night.
- Furnace Maintenance A fall tune-up that cleans the burners and flame sensor, tests every safety control and checks for a cracked heat exchanger.
- Furnace Replacement Sized from your house, matched to your AC coil and quality-reviewed by a manager on installs over $3,000.
- Emergency Heating Repair No heat on the coldest night of the year is an emergency. We answer around the clock with no surprise fees.
- Heat Pumps One outdoor unit that heats in January and cools in August. Often the smarter replacement for an all-electric home.
- Air Handlers The indoor unit that moves the air, holds the coil and, in many Texas homes, carries the electric heat strips.
- Thermostats Smart and programmable thermostats wired correctly for your furnace, heat pump or two-stage system.
Current Specials
Save on the work your home needs most.
Both Locations
HVAC
Up to $200 off Duct Cleaning
Expires 12/31/2026
Both Locations
HVAC
$99 Furnace Tune-Up
Expires 12/31/2026
Both Locations
Whole-Home
$50 Off Any Service
Expires 12/31/2026
Both Locations
HVAC
No Payments, No Interest For 6 Months on a New A/C System
Expires 12/31/2026
Both Locations
Drain & Sewer
$83 Drain Clearing or It’s Free
Expires 12/31/2026
Austin
Electrical
Up to $1,000 Off Generator
Expires 12/31/2026
Fix It or Replace It? We Will Show You the Math
A furnace that only runs a few weeks a year can last a long time, so age alone is not the answer. What matters is what failed, what the repair costs, how the heat exchanger looks and what the next failure is likely to be. An igniter on a twelve-year-old furnace is an easy repair. A cracked heat exchanger on a twenty-year-old unit is a replacement, full stop, because it is a carbon monoxide risk. We put both numbers in front of you, the quote is good for 72 hours and financing is available if the answer is a new system. Plenty of customers choose the repair, and we are glad to do it. If you would rather start from your city, see Austin furnace repair or San Antonio furnace repair.
Frequently Asked Questions
What kind of furnace do most homes in Austin and San Antonio have?
Most homes with natural gas have a gas furnace in the attic, a hall closet or the garage, with the air conditioner’s evaporator coil sitting on top of it and sharing the same blower and ductwork. Many newer subdivisions and all-electric homes have no furnace at all: they heat with a heat pump, or with an air handler that carries electric resistance heat strips. Each type fails in its own way, and each needs a technician who has worked on it before. Radiant services all three across both cities, so you do not have to know which one you have before you call. Tell us what the system is doing and we will sort it out at the house.
Can you service a furnace that another company installed?
Yes. Most of the furnaces we repair and maintain were installed by someone else, sometimes decades ago, and it makes no difference to how we approach the job. Our technicians work on gas and electric equipment from the major manufacturers, and the diagnosis is the same: test the sequence of operation, find the part that is failing and quote the repair in writing. If your original installer is no longer in business, or you bought the house with the furnace already in it, that is a very normal starting point. In San Antonio, customers of Schmidt Mechanical are now served by Radiant, and we have their systems’ history to work from.
Do I need a carbon monoxide detector if I have a gas furnace?
Yes, and it is one of the cheapest pieces of safety equipment you can own. A gas furnace burns fuel inside a heat exchanger and vents the exhaust outdoors. A crack in that heat exchanger, a blocked flue or a rusted-out vent connector can let carbon monoxide into the air the blower is pushing through your house, and you cannot smell it. Put a detector on each level of the home and near sleeping areas, and replace the units when they reach the age on their label. We check the heat exchanger and the venting during every furnace tune-up, but a detector is what protects you the other 364 days.
Does Radiant install and repair furnaces in San Antonio, or just Austin?
Both. Radiant has run offices in Austin and San Antonio since 1999, each with its own Texas HVAC license, so the technician who comes to your house in Boerne, Schertz or New Braunfels is dispatched from the San Antonio side, not driven down from Austin. The service is the same in both markets: 24/7 availability, upfront pricing with no surprise fees, and the Home Comfort Guarantee on every job. If you were a Schmidt Mechanical customer in San Antonio, your furnace is now cared for by the Radiant team. See the San Antonio heating and Austin heating pages for local details.
What Our Customers Say
Don't just take our word for it — hear from our satisfied customers
★★★★★
Our 18 year old HVAC system finally gave out this past week, so we reached out to Radiant to see what could be done. They sent a tech out named Bryan the same day, and he did a great job looking over the entire HVAC system. He was friendly and helpful in explaining everything that he saw, and our options moving forward. We decided to replace the entire system, so we met with Jacob (same day thankfully) to find the best HVAC system for our needs. Jacob was friendly, professional, and did a great job explaining the different options on offer. Radiant was able to set-up next day install, which was much appreciated, because the temps were still going to be cold in the coming days.
The install team consisted of Carlos and Pablo, who were very courteous and professional, and were kind enough to answer any questions I had regarding the install. They did a great job installing our new HVAC system, and were tidy which is always appreciated! Before they left, they explained everything that had been done, and showed me photos of the work.
Our entire experience from start to finish was great. I appreciate that they send photos of who is coming to your home too. Friendly, kind, professional team members, and good work all the way around. Thanks Radiant!
The install team consisted of Carlos and Pablo, who were very courteous and professional, and were kind enough to answer any questions I had regarding the install. They did a great job installing our new HVAC system, and were tidy which is always appreciated! Before they left, they explained everything that had been done, and showed me photos of the work.
Our entire experience from start to finish was great. I appreciate that they send photos of who is coming to your home too. Friendly, kind, professional team members, and good work all the way around. Thanks Radiant!
★★★★★
This is the first time I’ve used radiant my neighbor recommended them…. I called them today and they set me up an appointment on the same day. I was totally shocked at that and the service call was only $39!!…. Highly recommend them Danielle showed up and he was a great guy and he put up with all my wishy-washiness and I had to hurry him because I was heading to church and he got caught in a lot of traffic getting here he even would’ve installed the part that broke but I Didn’t have the time tonight….. He was patient with me and just told me to call the office first thing in the morning and get a service call set up…. Thank you so much Radiant!!….
With another cold front coming in tomorrow now I just hope they can get me scheduled for a separate call tomorrow but I have a feeling they will. They are such a great company!!😊😊
With another cold front coming in tomorrow now I just hope they can get me scheduled for a separate call tomorrow but I have a feeling they will. They are such a great company!!😊😊
★★★★★
My unit had been acting funky for a bit and then decided it would shed its mortal coil and go to the next life. I called an another company lets call them company A since I had a warranty with them thinking I could save a few bucks. They showed up 2 hours late of given window. Warranty didnt cover any of the perceived issues ( not really their fault, maybe). Double billed me (why pay 700 for a service call when you can pay 1400!!! ie: they ran my card twice) and then even though issue still wasnt fixed wanted to upsell me some more for close to 3k or get another sweet unit for an overpriced amount.
I'll admit I was getting desperate. Do I let the giant commercial bad guys win? Give them all my money I could be using on fishing gear? My neighbor happens to work at Schmidt Mechanical Group (shout out to Jared) and got me in touch with their service technicians for a 2nd opinion. ENTER Richard Moreno. Showed up at the beginning of time window. Diagnosed the multiple issues in a timely manner. Explained to me what was going on and why and hand held me through what needed to be done now and what to expect in the future. Worked on both of my units. My bill came to a FRACTION of what was recommended by company A. Mr. Moreno was very professional, kind, and honest. As a first time home owner whos been bamboozled by companies like company A, Schmidt Mechanical Group just gained a customer for life. Look forward to doing more business with them and their techs are awesome. Dont be like me and use company A first. Use this company.
I'll admit I was getting desperate. Do I let the giant commercial bad guys win? Give them all my money I could be using on fishing gear? My neighbor happens to work at Schmidt Mechanical Group (shout out to Jared) and got me in touch with their service technicians for a 2nd opinion. ENTER Richard Moreno. Showed up at the beginning of time window. Diagnosed the multiple issues in a timely manner. Explained to me what was going on and why and hand held me through what needed to be done now and what to expect in the future. Worked on both of my units. My bill came to a FRACTION of what was recommended by company A. Mr. Moreno was very professional, kind, and honest. As a first time home owner whos been bamboozled by companies like company A, Schmidt Mechanical Group just gained a customer for life. Look forward to doing more business with them and their techs are awesome. Dont be like me and use company A first. Use this company.
*Offers cannot be combined with other promotions or applied to dispatch fees. No cash value. Must present offer at time of service. Call for details.
