North Texas weather can be unpredictable. One afternoon you're running the AC, and the next morning you're reaching for the thermostat because the house is freezing. But what happens when the furnace clicks, tries to start, and leaves you with nothing but cold air? It could be a worn ignitor, a faulty flame sensor, or an electrical problem keeping the heating cycle from completing.
At CityLine Air Conditioning, we've seen how quickly a heating problem can disrupt a household. Our furnace repair technicians test the system to pinpoint the fault instead of relying on symptoms alone. Whether it's a minor component or a more involved repair, you'll get a clear explanation and a written price before we begin.
A furnace doesn't always quit without warning. Sometimes it clicks repeatedly, blows air that never gets warm, or starts heating only to shut off again. Those little behaviors can tell us a lot about where the problem might be. Here are six signs worth paying attention to.
It clicks, but the heat never comes on.
You hear the furnace trying to start, but nothing happens. A worn ignitor, gas supply issue, or faulty safety switch could be interrupting the ignition process. We'll test the components to find out what's stopping it.
It lights up, then shuts right back off.
The burners fire, giving you hope for a second, and then everything goes quiet. A dirty flame sensor is one possible culprit, although other ignition or safety problems can cause the same behavior.
Cold air keeps coming through the vents.
Before assuming the furnace has failed, check whether the thermostat fan is set to ON instead of AUTO. If the air stays cold while the thermostat calls for heat, the furnace may have an ignition or heating problem.
It runs for a few minutes, then quits.
That's frustrating when the house is still cold. A clogged filter or airflow restriction can cause the furnace to overheat and trigger a safety shutdown. If it keeps happening, the system needs a closer look.
Your gas bill is higher, but nothing has changed.
If you're using about the same amount of heat but paying noticeably more, the furnace may be running longer than necessary. Dirty components, airflow problems, or thermostat issues could be contributing. Fuel rates and outdoor temperatures matter, too.
You smell gas or your carbon monoxide alarm goes off.
This is different from an ordinary furnace breakdown. Get everyone outside immediately. Once you're safely away, call 911 or your gas utility's emergency line. Don't restart the furnace or return inside until emergency personnel say it's safe.
Not sure whether it's a repair or something bigger? We'll diagnose the problem and explain your options. If repairs are becoming frequent or expensive, you can compare them with furnace installation and replacement. For a system that's working but due for its seasonal check, see furnace maintenance. If you've lost heat during freezing weather, contact us about emergency heating repair.
Furnace repair costs can vary quite a bit. A dirty flame sensor might need a simple cleaning, while a failed blower motor or control board can be a much bigger expense. The price comes down to what's failed, the parts needed, and the work involved.
Our diagnostic visit costs $89, but if you approve the repair and we finish it during the same appointment, that fee comes off your final bill. You'll see the repair price in writing before any work begins. And if the cost is getting close to what an older furnace is worth, we can also provide a free replacement estimate so you can compare both options.
Diagnostic, waived with a same-day repair.
Free replacement estimates
Say the ignitor fails on an older system that has needed nothing else in years: a new ignitor gets it heating again, and that repair is easy to justify. A cracked heat exchanger is a different case, because that's the part that keeps combustion gases separate from the rooms you live in.
The repair gets priced before anything else. You see a replacement figure only when the factors below point that way.
| Factors to Consider | Repair Usually Makes Sense | Worth Pricing a Replacement |
|---|---|---|
| Type of Component Failure | An ignitor, flame sensor, limit switch, or inducer motor | A cracked heat exchanger |
| Frequency of Breakdowns | First major repair in several years | Repeated breakdowns over recent winters |
| Cost of Repairs | A small fraction of replacement cost | Repairs approaching the cost of a new furnace |
| Condition of Other Components | Blower motor and control board are working properly | Multiple components showing signs of wear |
Your furnace doesn't have to be one we installed. Our technicians repair major brands, including Carrier, Trane, Lennox, Goodman, and Amana. Whether it's an older gas furnace or a newer high-efficiency model, we know how to work through its heating and ignition problems.
Getting the heat back is important, but making sure the furnace runs safely matters just as much. Our technicians check the relevant ignition components, gas connections, and safety controls when diagnosing a heating problem. We won't put a furnace back into service if we find an unresolved safety hazard.
A furnace repaired in February might not see much use again until November. That's why our work comes with a 365-day money-back guarantee. If something isn't right with the repair, give us the opportunity to correct it. If we can't resolve the issue under the guarantee's terms, you may qualify for your money back.
A few questions help us understand the problem. Is the furnace completely silent, trying to start, or running without heat? Our office arranges a visit and sends an appointment confirmation.
Rather than replacing the first suspicious part, our technician works through the heating sequence. Ignition, airflow, electrical components, and safety controls are tested as needed to find what's interrupting the heat.
No mystery charges or unexplained parts. We show what failed, explain the fix, and put the repair cost in writing. The work only moves forward once the price is approved.
A successful repair means more than hearing the burners light. We run the furnace through a heating cycle, check that warm air reaches the vents, and confirm proper operation before packing up.
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No cooling or no heat? Call (972) 776-4455, day or night.
A furnace rarely picks a convenient time to stop working. Our Richardson office handles calls during regular business hours, and a live answering team takes over overnight. That means you can reach someone at (972) 776-4455, even when the house starts getting cold at midnight.
You can request furnace repair on Saturdays and Sundays, too. Outside our summer peak season, weekends don't carry the additional seasonal service charge. Our office team will check availability and help arrange your appointment.
Tell us what's happening and whether anyone in the household is vulnerable to the cold. Most overnight calls can be scheduled for the following morning, but urgent situations are assessed individually. Evening dispatch depends on technician availability.
4.7stars from 700+ Google reviewsDon't spend another cold night wondering what's wrong. Call (972) 776-4455 or request furnace repair online.
A broken furnace in Plano needs attention just as much as one in Frisco or McKinney. Based in Richardson, our heating technicians travel throughout North Texas, including Allen, Carrollton, Irving, Grapevine, Bedford, Euless, Hurst, Haltom City, and North Richland Hills.
Our coverage also reaches parts of Dallas and Fort Worth, although some neighborhoods are served by ZIP code. If a city isn't listed here, that doesn't necessarily mean it's outside our service area. Give us a call with the address, and we'll check availability.
Our Service Area
Don't see your street? Call (972) 776-4455 and ask.
The technicians were professional and very knowledgeable. We had our AC serviced, new Gas Furnace installed with air purifier, and also had our air ducts cleaned. I would go to CityLine first before any other company!
Kyle Cooper
The technician, Alberto, arrived on time, knew the equipment he was working on, was very professional, and was happy and very thorough.
Alann Nevarez
They contacted us in a timely manner, were on time for the service call and took care of the issues.
Jeffrey N.
Alberto Nevarez was great. Helped inform us of everything we needed to know plus extra. He went above and beyond to educate us as new home buyers of our systems and needed maintenance. 10 out of 10 would recommend
Tony A.
CityLine came to my home to check my unit for heating for this winter and were excellent. Technician Jay Jones was superb! He explained in detail everything he reviewed and gave me confidence in the service provided. 10/10! Would recommend to everyone!
Ryan F.
Travis came by to do a check up on the system. He's very courteous and friendly. All is well with the system.
Adrien C.
December 30, 2024When your furnace starts acting up during a chilly Texas winter, it’s more than just an inconvenience—it’s a real problem. One common issue we see at CityLine Air Conditioning is short cycling, where your furnace repeatedly turns on and off before heating your home properly.
November 26, 2023A furnace is a heating system that is commonly used in households to provide warmth during colder months. It is an essential appliance that requires proper maintenance and attention to function efficiently.
November 27, 2023A furnace is a crucial component of a home’s heating system, responsible for providing heat during cold weather. It works by converting fuel, such as gas, electricity, or oil, into heat, which is then distributed throughout the home via ducts or pipes.
The blower may be running even though the burners aren't producing heat. A failed ignitor, gas valve issue, or tripped safety control could be responsible. We'll test the system to identify the cause.
Absolutely. Many furnace problems involve individual components, such as ignitors, flame sensors, or blower motors. If the remaining equipment is in good condition, replacing the failed part may be all that's needed.
Some repairs can be completed during the first visit, particularly when the required part is available. More complicated faults or manufacturer-specific components may require additional work or a return appointment.
That depends on the noise. Rattling may indicate a loose panel, while banging or grinding could signal something more serious. Switch the furnace off if the sounds are unusual or severe, and arrange an inspection.
Sometimes. A failing blower or furnace performance issue can affect airflow, but ductwork problems may also be responsible. We'll check what's causing the temperature difference before recommending a repair.
Office hours 8 AM to 6 PM, with phones answered around the clock.
