Calls for AC repair in McKinney, TX, come from Victorian cottages a few blocks off the old courthouse square and from two-story homes in subdivisions that did not exist twenty years ago. The equipment, the ducts and even the electric utility can differ from one part of town to the next. Below is what sets McKinney apart and what happens when you call the free line.
Dallas Air & Heating is a phone line, not a contractor. Dial (469) 649-7066. The automated assistant first asks whether the trouble is cooling or heating, then asks for your name, a number to reach you, your ZIP and what the system is doing. Next, the call is handed to an independent, locally owned HVAC company serving McKinney. That company does the diagnosis, gives you its price and does the work.
McKinney: an old county seat that became a big city fast
McKinney has been the Collin County seat since the 1840s, and the 1876 courthouse still stands on the downtown square, now home to the McKinney Performing Arts Center. For more than a century the town stayed small. The census counted 15,193 people in 1970 and 21,283 in 1990. Then the subdivisions arrived: 54,369 residents in 2000, 131,117 in 2010 and 195,308 in 2020. The Census Bureau estimated about 236,000 by mid 2025, and it ranked McKinney among the fastest growing large cities in the country in the 2010s.
That history leaves two very different kinds of houses. Around the square sit homes built long before central air, which got their ducts squeezed into attics and crawl spaces decades later. Out toward Stonebridge Ranch, Craig Ranch and the newer areas north and west, most homes were built with central systems from day one, and many of those original systems are now old enough to need real attention. A good technician asks which kind of house you have before suggesting anything.
Old McKinney or new McKinney: what to ask about the system
A rough guide, not a diagnosis. Any house can have had its system replaced or its ducts redone. The data plate on the outdoor unit shows the year it was made and the refrigerant it uses.
| Type of home | Common situation | Worth asking |
|---|---|---|
| Historic homes near the square | Central air added long after the house was built. Duct runs can be long, narrow or poorly sealed, and some rooms never cool evenly. | Were the ducts inspected? Would a ductless unit suit the room that never keeps up? |
| Older subdivisions from before 2000 | Likely on a second or third system. Any unit still running R-22 can only be refilled from shrinking stocks, because U.S. production and import of R-22 ended in 2020. | What refrigerant is in it? How does the repair price compare with a new system? |
| 2000s and early 2010s boom homes | Many still have builder installed equipment that is now 12 to 25 years old, when capacitors, fan motors and coils commonly wear out. | Can I see the repair price and a replacement price side by side? |
| Homes built in the last decade | Usually inside the parts warranty if the equipment was registered. Problems are more often drains, thermostats or settings. | Is this covered by the manufacturer's parts warranty? Who registered it? |
Which utility serves your McKinney address
McKinney sits on more than one utility map. Electricity guides list Oncor as the delivery utility for McKinney, which means you choose a retail provider and Oncor owns the poles, wires and meter. But the city's own energy report says its facilities buy electricity from a retail provider and also from CoServ and Grayson-Collin Electric Cooperative, two member-owned co-ops. Gas is split too: the city buys natural gas from both Atmos Energy and CoServ.
So a McKinney neighbor across a road may have a different electric company and a different gas company than you do. Before a storm or a summer outage, look at the top of each bill and save the outage and emergency numbers in your phone. None of these utilities work on air conditioners or furnaces, but knowing which one you have saves time when you are trying to decide whether the problem is the power or the system.
- Nothing in the house has power. Report the outage to the utility on your bill. Switching the thermostat off until the power has been back for a while spares the compressor a rough restart.
- Lights work, AC does not. Check the thermostat mode, setting and batteries, then look for one tripped breaker for the indoor or outdoor unit and reset it once.
- The breaker trips again. Leave it off and call. A repeat trip points to a fault that needs a technician.
- Cold air is weak or warm. Check for a clogged filter and leaves or grass packed against the outdoor coil. If you see ice on the copper lines, switch the system off and call.
Blackland clay and the outdoor unit
McKinney lies in the Texas Blackland Prairie, the belt of dark clay soil that runs from the Red River through Dallas-Fort Worth. These clays shrink and crack in dry weather and swell when they soak up rain. Over a few seasons that movement can tilt a condenser pad, pull on the copper line set where it enters the wall and change the slope of the condensate drain so water backs up into the indoor unit. A careful technician checks that the outdoor unit is level and that the drain still runs downhill, because a drain that has lost its slope will keep clogging however many times it is flushed.
Before you replace a system in McKinney
The City of McKinney publishes a list of home repairs that need no permit. For heating and cooling it covers only minor work, such as changing filters and fixing small leaks without moving piping. A full replacement is not on that list, and the city handles permits and inspections through its Citizen Self-Service portal. Ask that the permit appear on the written quote, and keep the inspection record with your house papers.
- A load calculation. A downtown home with new windows or a Craig Ranch home with a finished bonus room may need a different size than the old unit.
- The ducts. In older McKinney homes, a new system on old ducts can still lose cool air into the attic.
- The right incentives. If Oncor delivers your power, ask whether a project qualifies for Oncor's Home Energy Efficiency program, which works through approved service providers. Co-op members should ask CoServ or Grayson-Collin directly.
- The license number. Look it up yourself before you sign.
Why McKinney homeowners call the line
The same number for every part of town
Whether your utility is Oncor, CoServ or Grayson-Collin, the HVAC side of the call starts the same way. Your ZIP code decides which independent McKinney area company hears about the problem.
Answered when the heat peaks
An automated assistant picks up at 3 a.m. in August and on a holiday morning in January. There is no charge for the call itself; the only bill is from a company you choose to hire.
A summary before the company picks up
Mention whether the house is a historic home near the square or a newer subdivision, and whether the heat is gas or electric. The assistant can pass that along before the company comes on the line.
Help checking who shows up
The license note further down shows where to confirm a contractor's state air conditioning license before anyone opens up the equipment.
Services McKinney homes ask about most
Summer brings most calls for AC repair: warm air from the vents, a frozen line set or a drain pan that overflows through a ceiling. Owners of original 2000s equipment in the big subdivisions should read AC installation and replacement before a breakdown forces a rushed choice. McKinney homes heat with gas furnaces or electric heat pumps, and both get tested on the few hard freezes North Texas sees, so furnace and heating repair is worth knowing about before winter. A spring tune-up is the time to catch a weak part or a drain that has lost its slope.
AC Repair
Warm air from the vents, a unit that hums but will not start, ice on the lines or water in the ceiling. What a proper diagnosis covers in Dallas heat and what to ask before you approve a repair.
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.
Furnace and Heating Repair
No heat on a cold North Texas morning, a furnace that short cycles or a heat pump stuck in defrost. Gas safety first, then what a technician checks.
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.
How a McKinney call works
- 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.
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.
Areas near McKinney
Every Dallas-Fort Worth city the line answers for: