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When your furnace stops heating on a cold night, you need furnace repair you can rely on — quickly and safely. We get a technician to your door the same day, diagnose the real cause, check that the system is operating safely, and give you honest options before any work begins, across San Antonio, Schertz, and Cibolo.
When your furnace stops heating on a cold night, you need furnace repair you can rely on — quickly and safely. We get a technician to your door the same day, diagnose the real cause, check that the system is operating safely, and give you honest options before any work begins, across San Antonio, Schertz, and Cibolo.
Same-Day Furnace Repair in San Antonio
A Complete Diagnostic
Gas Safety Comes First
Same-Day Service
Options, Not Pressure
Call us and we'll have a technician at your door today. When it's 100° outside, a fast response isn't a nice-to-have — it's the whole job. We answer the phone seven days a week.
For most repairs we give you more than one way forward — fix what's failed, upgrade the failing part, or when a system's near the end of its life, put that money toward replacement instead. You decide. We don't push.
Why San Antonio Homeowners Call Daley Air for Furnace Repair
Fast, Safe, Fixed Right
A furnace that isn't working can also be a furnace that isn't safe. Every repair visit includes checking for combustion and carbon-monoxide concerns and inspecting the heat exchanger, so you're never trading a warm house for a hidden hazard.
We don't stop at the first thing we find. We evaluate the whole system — ignition, gas supply, venting, airflow, and controls — so a small problem hiding behind a bigger one doesn't send you a second repair bill two weeks later.
We Test It and Confirm It's Safe
Before we leave, we run the furnace and confirm it's heating the way it should — and just as important, that it's operating safely. We verify the venting is drawing properly and check for any combustion or carbon-monoxide concerns, then confirm performance and thermostat operation. You watch it work before we pack up.
We Make the Repair
Once you've selected the option that works best for you, our technicians get to work. We carry the parts needed for the most common furnace failures on our trucks, which means in most cases we're able to complete the repair during the same visit and have your heat running again before we leave. When a specialized part needs to be ordered, we'll let you know exactly what to expect and schedule the follow-up as quickly as possible.
We Diagnose the Real Problem
A proper repair starts with an accurate diagnosis. Our technicians take the time to thoroughly evaluate your furnace to identify the root cause of the issue rather than treating the symptoms. We test the ignition system, check the gas supply and venting, inspect the heat exchanger, and verify operation to pinpoint what's causing the problem. By finding the real source of the breakdown, we can recommend the right repair the first time, helping you avoid unnecessary costs, repeat service calls, and ongoing comfort issues.
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How a Repair Call Works
Why San Antonio Trusts Daley Air for Furnace Repair
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You Get Options and an Upfront Price
Before any work starts, you get the diagnosis in plain language and — for most repairs — more than one way forward, each with a price up front. Fix what failed, upgrade the part, or apply the cost toward a replacement if the furnace is near end-of-life. You choose. Nothing happens until you say go.
You Call, We Come Out — Same Day
When your furnace stops working, getting help quickly matters. That's why we schedule your service for the same day you call. Once your appointment is set, we'll send a message to let you know when your technician is on the way, so you know exactly when to expect us and can plan your day around a clear arrival time.
Not Sure If It's Worth Repairing?
If your furnace is old and the repair is major — or if there's a cracked heat exchanger — throwing money at it may not be the right call. We'll tell you honestly when a repair makes sense and when replacement is the smarter, safer spend, and we'll show you both numbers.
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Ignition & Flame Problems
A furnace that clicks but won't light, lights and shuts off, or shows a yellow or flickering flame usually points to the igniter, flame sensor, or gas supply. These are common failures, and we carry the parts to fix most of them on the spot.
Furnace Repair
Not heating, short-cycling, blowing cold air, cycling the blower nonstop, or making a noise it didn't used to. We diagnose it, check that it's safe, and give you options the same day.
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It's blowing cold air, or not heating the house at all.
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The furnace turns on and off every few minutes (short-cycling).
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The burner flame is yellow or flickering instead of a steady blue.
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You hear banging, rattling, squealing, or a boom on startup.
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There's a burning or unusual smell when it runs.
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Your heating bill jumped without a change in how you use it.
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The blower runs constantly and won't shut off.
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Your carbon-monoxide detector has gone off, or you suspect a cracked heat exchanger.
Signs Your Furnace Needs Repair Now
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Check your thermostat. Make sure it's set to "heat," the temperature is set several degrees above the current room temperature, and the fan is set to "auto." If your thermostat uses batteries, replace them — a weak battery can cause the system to behave unpredictably.
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Inspect your air filter. A dirty, clogged filter restricts airflow and is one of the most common reasons a furnace underperforms or shuts down on a safety limit. If yours looks gray and packed with dust, replace it with a clean one.
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Check your circuit breakers. Look in your electrical panel for a tripped breaker labeled for the furnace or air handler. If one has tripped, switch it fully off and back on. If it trips again right away, stop there and call us.
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Confirm the furnace power switch is on. Furnaces sometimes have a switch nearby that looks like an ordinary light switch — sometimes on or near the unit. Make sure it hasn't been flipped off by mistake.
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Make sure the furnace door is fully closed. Most furnaces have a safety switch that prevents them from running if the access panel isn't seated properly. Confirm it's closed and latched.
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Check that your gas is on. If other gas appliances in your home (stove, water heater) aren't working either, the issue may be your gas supply rather than the furnace itself.
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Make sure vents and registers are open. Closed or blocked supply vents — behind furniture, rugs, or curtains — can make the whole system struggle. Walk the house and confirm they're open and unobstructed.
Before You Call: A Few Things Worth Checking
If you've checked all of the above and your furnace still isn't heating properly, don't keep trying to force it — call us and we'll get a technician out the same day. And if you ever smell gas or your carbon-monoxide detector sounds, leave the home first and call from outside.
A cracked heat exchanger usually means it's time for a new furnace rather than a repair.
Q: Do you really offer same-day service?
A:Â Yes. Call us and we'll get a technician out to you the same day. When the part is in stock, we're usually able to complete the repair on that same visit as well.
Q: Is it safe to keep running my furnace if it's acting up?
A: It depends on what's wrong. A furnace that's short-cycling or blowing cold is usually a comfort issue, but symptoms like a yellow flame, a burning smell, or a carbon-monoxide alarm can indicate a safety problem. When in doubt, shut it off and call us — and if your CO detector is sounding, leave the home and call from outside.
Q: Do you repair systems you didn't install?
A:Â Yes. We repair any brand of furnace, whether we installed it or not..
Q: My furnace is old — should I repair it or replace it?
A: It depends on the furnace's age, the size of the repair, and whether there are any safety concerns like a cracked heat exchanger. We'll show you the cost of both and tell you honestly which one makes more sense. We don't push replacement to make a sale.
Q: What if it breaks down after hours or on the weekend?Â
A: We answer the phone seven days a week, 7am to 9pm. Call and we'll get you scheduled as fast as we can.
Furnace Repair Questions
More Heating & Cooling Services in San Antonio
When repair isn't the smart spend.
If your furnace is aging or unsafe to run, we'll show you both numbers and, if replacement is the
right call, install a properly sized system that heats every room and runs safely for years.
We handle your cooling, too.
Furnace acting up in winter, AC quitting in summer — it's the same team either way. When the weather
turns, we're here for same-day AC repair with the same honest, upfront approach.
No heat? Let's fix that today.
Same-day service, a full safety check, and honest options with upfront pricing — from a team San Antonio trusts.
We keep San Antonio homes warm and safe across our service area