The outdoor unit hums, but the fan isn't moving.
You can hear the AC trying to start, but nothing happens. A failing capacitor or fan motor could be keeping it from running.
The first really hot week arrives, and your AC can't keep up. Often the trouble started months earlier, in a spring hailstorm. Hail can flatten the thin aluminum fins on an outdoor unit, and bent fins block the airflow the system needs to shed heat. It may keep running, but with less cooling and more strain on the internal components.
Damage like that is easy to miss from the ground, so CityLine Air Conditioning checks the outdoor coil on summer repair calls across Dallas-Fort Worth. Our technicians photograph what they find, explain what it will cost you, and put the estimate in writing before any work begins. If your AC struggled this May or June, tell us whether hail hit your street this spring.

Most air conditioners don't quit without warning. They start making strange noises, struggle to cool certain rooms, or run longer than usual. In the middle of a Dallas-Fort Worth summer, those little problems can turn into a hot house pretty quickly. Here's what to watch for:
The outdoor unit hums, but the fan isn't moving.
You can hear the AC trying to start, but nothing happens. A failing capacitor or fan motor could be keeping it from running.
Warm air keeps coming from the vents.
Your thermostat is set to cool, but the house keeps getting hotter. Low refrigerant from a leak is one possible cause, though other cooling problems can produce the same symptom.
There's water near the AC, or it suddenly shuts off.
A blocked drain line can trigger a safety switch. If your system is in the attic, an overflowing drain can also leave water stains on the ceiling.
One room feels fine, but another won't cool down.
Weak airflow, a clogged filter, or a struggling blower motor could be keeping cool air from reaching every room.
Your electric bill keeps climbing.
If the AC runs all day without making the house comfortable, dirty coils, leaking ducts, or worn components could be making it work harder than necessary.
You notice a burning or electrical smell.
Turn the AC off at the thermostat and leave it off until a technician checks it. Electrical problems aren't worth taking chances with.
Not every cooling problem means an expensive repair. Sometimes, one worn part is all it takes. We'll find the issue, explain your options, and help you decide whether a repair or air conditioner replacement makes more sense. Need help right away? Call us for emergency AC repair, or schedule cooling system maintenance to prevent future breakdowns.
A cooling problem doesn't always come with a big repair bill. Sometimes it's a worn capacitor, a clogged drain line, or a dirty filter restricting airflow. Other times, the trouble runs deeper. The only way to know what you're paying for is to find out what's actually wrong.
We charge $89 for an AC diagnostic visit, and if you approve the repair and we finish it that same day, we'll take the full $89 off your bill. The final price depends on the failed part, the work involved, and your system's condition. Before anything gets fixed, you'll have a written estimate showing exactly what the repair will cost.
Diagnostic, waived with a same-day repair.
Free replacement estimates
A repair might get your air conditioner cooling again, but will it be worth the money a year from now? Say the compressor fails on a 15-year-old system. Replacing it could solve today's problem, but it won't undo the wear on other components. If the indoor coil fails next summer, you're facing another expensive repair.
These four factors can help you decide whether another repair is worth the investment or it's time to consider a replacement.
| What to consider | Repair may make more sense | Consider replacement when |
|---|---|---|
| What's broken? | A capacitor, contactor, fan motor, or clogged drain line needs attention. | The compressor or indoor coil fails, making repairs more expensive. |
| What refrigerant does it use? | It uses R-410A, which is still available for servicing existing systems. | It uses R-22, which is no longer produced or imported in the U.S. |
| How old is your system? | It's under 10 years old and otherwise in good condition. | It's 10–15 years old or older, and repair costs are adding up. |
| How often does it break down? | This is its first significant repair. | You've already paid for major repairs in recent years. |

You know who is coming before anyone arrives. Booking brings a text with a two-hour window. Before the technician sets off, a second text and email carry their photo, a short bio, and a live link tracking the van to your door.
Your technician photographs the failed part on an iPad and shows you the screen, so a diagnosis is something you look at rather than something you are told. The repair price goes in writing before a single tool comes out.
Our 365-day guarantee covers repairs and new installations for a full year. If the fix does not hold, tell us and we will come back and put it right. If we cannot, we refund what you paid for that work.
Four steps, from the first phone call to a system you can hear running again.
One of our office team answers, asks what the AC is doing, when it started, and how old the system is, then books the visit and confirms your window by text.
The technician checks the thermostat, puts gauges on the outdoor unit, and inspects the air handler, usually in the attic. The diagnostic is $89, and photographs of the fault go on the iPad.
You get a written estimate covering the failed part, the labor, and what it comes to. We talk through the options, including replacement on an older system. Nothing is touched until you approve it.
The technician then runs the system, checks that it is cooling properly, and walks you through what was replaced. If the part is on the truck, the repair is finished for that visit.
Book Now
No cooling or no heat? Call (972) 776-4455, day or night.
Our office team answers (972) 776-4455 between 8 AM and 6 PM. Expect six or seven short questions: what your AC is doing, when it started, how old the system is, and whether a home warranty covers it. Your answers decide which technician comes and what goes on the truck. A text and an email will then confirm your two-hour window.
Mornings fill first through the summer, so call early if you can. Tell us what your thermostat actually reads, too. A house at 88 and climbing is a different job from one that cools but rattles, and our dispatcher sorts the day on that.
After 6 PM an answering service picks up, takes the same details, and books you in rather than leaving you a message to chase in the morning. Saturday visits are available. If anyone at home is at risk in the heat, say so, and see emergency AC repair.
4.7stars from 700+ Google reviewsWarm air from the vents? Call (972) 776-4455 any hour · Book Online
Our technicians work out of Richardson, and most of the cities below are a short drive from the Sherman Street shop, which determines how quickly someone reaches you for a breakdown. You get the same technicians, the same diagnostic steps, and the same written pricing in every one of them. Coverage in Fort Worth and in the North Dallas neighborhoods runs by ZIP code, so call with your address and we will confirm it in a moment.
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.




May 5, 2026You might not think much about dust. It gathers on shelves, settles on furniture, and seems like nothing more than a minor household annoyance.
May 4, 2026It’s 2:00 PM on a July afternoon in Dallas-Fort Worth. The thermostat reads 97°F outside, and you just realized your AC is not turning on.
May 4, 2026You’re sitting in your living room when your air conditioner kicks on and something sounds… wrong. Maybe it’s a metallic banging that wasn’t there last week.
Yes. We repair Amana, Goodman, Carrier, Bryant, Lennox, Trane, American Standard and Comfortmaker systems, among others, no matter who put them in.
Make sure the thermostat is set to cool and below the room temperature, and replace its batteries if the screen is blank. Swap out a dirty filter. If the AC breaker has tripped, reset it once, and if it trips again, leave it off and call us. Don't open the outdoor unit's panels, because the capacitor inside can hold a charge.
Ice on the copper lines or the indoor coil often means air isn't moving across the coil, or the refrigerant is low. Switch the thermostat from cool to off so the ice can melt, check the filter, then call us. Running a frozen system can strain the compressor.
Yes. A heat pump cools the same way a central AC does, so most problems on this page apply to it too. We also repair ductless mini-splits. For more, see heat pump repair and mini-split repair.
Yes. Members move up the schedule during the hottest weeks of summer, and they pay no emergency service charge.
Office hours 8 AM to 6 PM, with phones answered around the clock.