AC repair in Dallas tends to come all at once: the first long stretch of triple digit afternoons arrives, systems that limped through spring finally give up, and everyone wants a technician today. This page explains what the common symptoms usually point to, which checks are safe to do yourself, what a careful diagnosis looks like, and the questions worth asking before you say yes to a repair.
Dallas Air & Heating does not repair air conditioners. It is a free phone line. When you call (469) 649-7066, an automated assistant asks whether the problem is cooling or heating, takes your name, callback number, city or ZIP and a short description of what the system is doing, then transfers you to an independent, locally owned heating and air conditioning company that works in your part of Dallas-Fort Worth. That company diagnoses the problem, gives you its price, does the work and is paid by you.
Why Dallas summers find the weak part
The National Weather Service office in Fort Worth keeps the official records for DFW Airport. Under the 1991 to 2020 normals, DFW averages about 20 days a year at 100 degrees or hotter, and the first one typically arrives around July 1. Some summers go far past that. The record is 71 days of triple digits in 2011, the longest unbroken streak is 42 days from June 23 to August 3, 1980, and the airport hit 113 degrees on back to back days that June, still the hottest readings on record there.
On days like that, a healthy system runs nearly nonstop. Long run time is exactly what exposes a tired part: a starting capacitor that has been cooking inside a metal cabinet, a fan motor with worn bearings, a drain line half full of algae, an outdoor coil matted with grass clippings and cottonwood fluff. Most mid-summer breakdowns are one small part that finally failed under load, which is why an accurate diagnosis matters more than anything else on the invoice.
One more thing about very hot afternoons: a system can be working perfectly and still sit a couple of degrees above the setting at 5 p.m. Home systems are sized for a typical hot day, not the hottest hour on record. If the house catches up after sunset and the air from the vents is clearly cold, that is usually not a repair call.
What you notice, what it usually means, what a technician checks
These are the patterns HVAC technicians run into most often. Use them to describe the problem clearly on the phone, not to diagnose it yourself. Only someone with meters and gauges on the system can say which part actually failed.
| What you notice | Likely causes | What a good technician checks |
|---|---|---|
| Vents blow warm or barely cool air | Dirty filter, frozen indoor coil, dirty outdoor coil, outdoor fan not running, refrigerant leak | Airflow first, then the outdoor fan and compressor, then the refrigerant charge against the manufacturer's charging chart |
| Outdoor unit hums but the fan sits still | Weak or failed capacitor, seized fan motor, compressor struggling to start | Capacitor reading against its rated value, motor amperage, compressor windings |
| Nothing comes on at all | Tripped breaker, dead thermostat batteries, drain safety switch has shut the system off, failed control board or transformer | Power at the indoor and outdoor units, the low voltage control circuit, the float switch |
| Ice on the copper line or indoor coil | Restricted airflow (filter, blower, closed vents, dirty coil) or low refrigerant | Blower and coil condition once the ice has melted, then pressures and line temperatures |
| Water in a ceiling, closet or around the indoor unit | Clogged condensate drain, rusted or cracked drain pan, failed float switch | Drain line cleared and flowing, pan condition, the safety switch tested |
| Breaker trips again after one reset | Shorted motor or compressor, damaged wiring, failing contactor | Insulation and amperage tests to find the fault before anything is restarted |
| Turns on and off every few minutes | Oversized system, thermostat near a lamp or sunny window, low charge, overheating compressor | Thermostat location and wiring, run cycle timing, charge and compressor temperature |
| Grinding, squealing or a loud bang | Fan blade striking something, failing motor bearings, compressor trouble | Fan blade and motor mounts, bearings, compressor sound and draw under load |
Four safe checks before you call
A fair share of no-cooling calls turn out to be something simple. None of these steps involve opening a panel, touching wiring or going near refrigerant.
- Thermostat. It should be on Cool, not Heat, Off or Fan only, and set a few degrees below the room temperature. A blank or flickering screen often means dead batteries.
- One breaker reset. The indoor unit and the outdoor unit usually have their own breakers. If one has tripped, reset it once. If it trips again, leave it off: that is a fault for a technician to find.
- Air filter. The U.S. Department of Energy suggests cleaning or replacing the filter every month or two during the cooling season, more often with pets or dust. A packed filter starves the coil of air and can freeze it.
- Outdoor unit and drain. Look without reaching in. Clear leaves, clippings or shrubs from around the cabinet (the Department of Energy suggests at least 2 feet of open space). Then find where the small drain pipe exits the house. If there is a float switch with water standing in its pan, the system may have shut itself off on purpose.
Done all four and the house is still warm? Call and say exactly what you saw: the thermostat reading, whether the outdoor fan spins, any ice or water. The company you are put through to uses that to plan the visit.
Turn it off and stop trying if you see this
Some problems get more expensive the longer the system runs. Set the thermostat to Off and call if you notice any of these:
- Ice on the lines or the indoor coil. Let it melt with the system off (the fan alone can run) before anyone tests it.
- A humming or buzzing outdoor unit with a still fan. The compressor may be straining and overheating.
- A burning, electrical or hot plastic smell. Turn it off at the thermostat and at the breaker.
- Water coming through a ceiling. System off, a bucket under the drip, and move anything valuable out of the way.
- A breaker that trips a second time. Repeated trips are a fault, not bad luck.
If the house is getting hot and someone at home is elderly, very young or unwell, move them somewhere cooler first. The emergency AC repair page covers heat safety and what to do while you wait.
What a proper AC repair visit includes
You do not need to understand every reading, but you can tell a careful visit from a rushed one. A good technician works through the system in a sensible order and explains what they find in plain words.
- Airflow before gauges. The Air Conditioning Contractors of America (ACCA) is blunt about this: there is no point taking temperature and pressure readings on a system that is not moving the right amount of air. Filter, blower, coil and ducts come first.
- Electrical tests under load. Capacitor readings compared with the value printed on the part, the contactor's condition, and the current draw of the compressor and fan motors.
- Refrigerant charge measured, not guessed. Pressures and line temperatures compared with the manufacturer's charging method for that unit. If it is low, the next job is finding the leak, using a leak detector.
- The temperature drop in context. Many people quote a "15 to 20 degree split" between the air going in and the air coming out. ACCA calls that rule of thumb unreliable and says to use the manufacturer's data for the actual conditions, so treat it as one clue, not a pass or fail.
- Drain and safety switch. The condensate line cleared and flowing and the float switch tested, especially when the indoor unit is in the attic.
- A written finding and price. What failed, why, what the repair will cost, and anything else they noticed that is not urgent.
Attic units and wet ceilings
If your indoor unit sits in the attic, the attic is hotter than the outdoor air on a summer afternoon, so the blower, coil and ducts work in harsh conditions. It also means a clogged drain has nowhere to go but down through the drywall. Many attic installations have a backup: a second pan under the unit with its own drain, or a float switch that cuts the system off when water rises.
Ask the technician which one you have and whether it works. If a small pipe that ends above a window or under the eave suddenly starts dripping, that is often the backup drain telling you the main one is blocked. It is worth a call before the ceiling stains.
Repair it or price a replacement?
Most AC repair calls end in a repair. Replacement belongs in the conversation only when the parts or the numbers say so. If a company leads with replacement, ask it to price the repair as well.
Usually a sensible repair
- A failed capacitor, contactor, fan motor or thermostat
- A clogged condensate drain or failed float switch
- A small, reachable leak on a newer system
- A well maintained system with plenty of life left
Worth getting a replacement price too
- A failed compressor on an older system
- A leaking indoor coil on a system near the end of its life
- A system that runs on R-22, which has not been produced or imported in the U.S. since 2020
- The same unit needing repair after repair in one season
A system that uses R-410A can still be repaired and recharged. In May 2026 the EPA also amended its rules so that R-410A units built before 2025 can still be installed until existing stock runs out. Nobody should tell you a working R-410A system has to go because of a deadline. The free refrigerant guide explains the change in plain language, and the AC installation page covers what a full replacement quote should list.
Questions to ask before you approve a repair
- What is your TDLR license number?Texas licenses air conditioning and refrigeration contractors through the Texas Department of Licensing and Regulation. Look it up yourself before work starts.
- What is the diagnostic or trip fee, and is it credited to the repair?Get that answer before the technician is sent, not after.
- What exactly failed, and can you show me?A good technician is happy to point to the burned contactor or show you the capacitor reading.
- Can I have the price in writing?Parts, labor and any refrigerant, with a total, before the work begins.
- If it is low on refrigerant, where is the leak?A recharge with no leak search is a short term fix.
- Is repair a real option here?Ask this before any replacement is quoted, and ask for both prices side by side if replacement comes up.
Check the license yourself. In Texas, air conditioning and refrigeration contractors are licensed by the Texas Department of Licensing and Regulation (TDLR), and the license number belongs on the company's quotes and invoices. Ask for it and look it up with the TDLR license search (opens in a new tab) before work starts. It is also fair to ask for a certificate of insurance.
Keeping the next AC repair away
A few habits go a long way in North Texas heat. Change the filter on schedule. Keep the outdoor unit clear of mulch, toys and overgrown shrubs, and point the mower's discharge away from it. Pick a steady setting and leave it: ENERGY STAR suggests 78 degrees when you are home and need cooling, and the City of Dallas gives the same advice during heat waves. Dropping the thermostat to 68 on a 104 degree afternoon does not cool the house faster; it just keeps the system running longer. Finally, book a spring tune-up before the first heat wave rather than in the middle of it, when companies are least busy and small problems are cheap to fix.
- Call any hourAn automated assistant answers (469) 649-7066 and asks whether it is about cooling or heating.
- Describe the problemGive your name, a callback number, your city or ZIP and what the system is doing.
- Get put throughThe call goes to an independent, locally owned heating and air conditioning company, which hears a short summary before it picks up.
- Deal with them directlyThat company diagnoses, quotes, does the work and is paid by you. If it cannot answer, it gets your details to call back.
How this line works: Dallas Air & Heating is a free phone line, not an HVAC company. It answers your call and connects you with an independent local heating and air conditioning company, which inspects, quotes and does the work, and which you pay directly. The line holds no HVAC license and does not repair, install or schedule anything itself. Those companies may pay Dallas Air & Heating a referral fee. You never pay the line. How it works.
Related services
Emergency AC Repair (24/7)
No cooling at night, on a weekend or in a heat wave. What to do while you wait, who is most at risk, and how after-hours calls are usually priced.
AC Installation and Replacement
When replacing beats repairing, why a load calculation matters more than the brand, and what a complete installation quote should list.
HVAC Tune-Up and Maintenance
What a real spring or fall tune-up includes, what it does not, and the simple filter and drain habits that keep a system out of trouble.
AC repair across Dallas-Fort Worth
The line takes calls from Dallas and the cities around it. Each area page covers what is different there, from the electric utility to local permit rules.
- All Dallas-Fort Worth service areas
- McKinney
- Frisco
- Plano
- Allen
- Richardson
- Garland
- Mesquite
- Irving
- Carrollton
- Lewisville
- Flower Mound
- Denton
- Fort Worth
- Arlington
- Grand Prairie
Before you hire anyone, the guide to choosing an HVAC company in Dallas walks through checking a license and comparing written quotes.