Air conditioner installation in Dallas, whether it is a first system or a replacement for one that gave out, is more than setting a new condenser on the pad. The outdoor unit, the indoor coil, the copper lines, the ducts in the attic and the paperwork with the city all decide whether a new system cools the house evenly for years or runs up the same bills as the one it replaced. This page goes through the decision in the order it usually happens, ending with a checklist you can hold against any written quote.
Dallas Air & Heating does not sell, size or install anything. It is a free phone line. Call (469) 649-7066 at any hour and an automated assistant takes your name, a callback number, your city or ZIP and a short description of what you need, then transfers the call to an independent, locally owned heating and air conditioning company. That company visits, measures, prices the job and does the work. You deal with it, and pay it, directly.
Repair or replace your Dallas AC?
The age of a system is a weak reason on its own to replace one that still runs. A better test has three parts: what actually failed, what the repair costs next to a new system, and what the old one costs to run through a North Texas summer. DFW Airport has hit 113 degrees twice, both in June 1980, and that summer set the yearly record of 69 days at 100 degrees or more, according to the National Weather Service in Fort Worth. Equipment here works hard for months at a stretch.
A failed fan motor or contactor on an older unit is a routine repair. A dead compressor or a leaking indoor coil is a bigger conversation, because those parts can cost a large share of a new system.
Refrigerant matters too. New R-22 has not been produced or imported in the U.S. since 2020, so recharging a leaking R-22 system keeps getting harder. An R-410A system is different: it can still be serviced, and no federal rule forces it out.
If a company recommends replacement, ask it to price the repair too. Two numbers side by side, in writing, are the fairest way to decide, and a good company will not mind writing both.
Sizing a new system: Manual J, then S, then D
The Air Conditioning Contractors of America (ACCA) publishes the three design procedures that turn a house into a correct equipment size and a duct layout that can deliver it. Ask which ones were used and ask to see the results.
- Manual J, the load calculation. It works out how much heat your home gains in summer and loses in winter, based on attic insulation, wall construction, window area and the direction they face, air leakage and the people inside. ACCA is clear that Manual J does not pick the equipment. It only measures the load.
- Manual S, choosing the equipment. Using the Manual J numbers and the manufacturer's performance data, Manual S selects a system that covers both the temperature load and the humidity load at local design conditions.
- Manual D, the ducts. It sizes the supply and return ducts so every room gets the airflow it needs. A new system on ducts that were too small to begin with will be loud, uneven or both.
Why it matters: ACCA lists short cycling, poor humidity control and rooms that never reach the set temperature as results of wrong sizing. An oversized unit cools the air quickly, shuts off before it pulls out moisture, and starts again a few minutes later. The house feels cold and clammy, and all those starts wear the equipment. Copying the old tonnage or using a square-foot rule is how that happens.
What has changed in new AC equipment
If the system you have went in ten or fifteen years ago, today's equipment differs in four ways that show up on a quote.
- Higher minimum efficiency since 2023. The U.S. Department of Energy places Texas in its hot-humid Southeast region. Since January 1, 2023, a split central air conditioner installed here must rate at least 14.3 SEER2 if it is under 45,000 BTU per hour (roughly under 3.75 tons), or 13.8 SEER2 at that size and above. Split heat pumps must reach 14.3 SEER2 and 7.5 HSPF2 nationwide. In this region the rule follows the installation date, so older stock below those numbers cannot be installed as new.
- New refrigerants. Under the EPA's Technology Transitions rule, new home systems use refrigerant with a global warming potential under 700, which in practice means R-454B or R-32. Both are classed A2L, or mildly flammable. Split systems holding more than four pounds of an A2L refrigerant carry a refrigerant detection system that, if it senses a leak, stops the compressor and runs the blower to disperse it.
- R-410A is still allowed if the stock is older. An EPA rule finalized in 2026 dropped the January 1, 2026 installation cutoff. Systems whose parts were made or imported before January 1, 2025 may be installed until supplies run out.
- The indoor coil has to match. An R-454B outdoor unit cannot run on an old coil built for R-410A or R-22. The efficiency rating only applies to a certified combination, which you can look up in the public AHRI Directory of Certified Product Performance using the AHRI reference number on the quote.
The free refrigerant guide explains the R-410A to R-454B change in plain language, including what it means if you are only repairing a system.
Permits for an AC replacement in Dallas
Inside the City of Dallas, swapping out a heating or cooling system is permitted work. The City's construction code says a person may not install or replace building service equipment without first obtaining a permit, and it defines building service equipment to include the equipment that provides heating, ventilation and cooling. Applications, payments and inspection requests go through DallasNow, the online permitting system the City launched in May 2025.
Texas law lets a homeowner do mechanical work on the homestead they own and live in without a license, but a City of Dallas article on home projects is plain that such work still needs a permit and inspection where the code calls for one. For most households the installing company pulls the permit. Texas rules require an air conditioning contracting company to give cities a list of the people authorized to pull permits under its license. Get the permit written into the price, be home for the inspection if you can, and keep the passed inspection record with your house papers.
If you live in Richardson, Garland, Irving, Mesquite or another city around Dallas, that city's building department sets its own rules and fees. Ask the company which office it will file with.
The ducts behind the ceiling
ENERGY STAR estimates that in a typical house about 20 to 30 percent of the air moving through the duct system is lost to leaks, holes and poorly connected ducts. When those ducts run through a Dallas attic in July, every leak is either dumping cooled air into the insulation or pulling hot attic air into the system. A new high-efficiency unit cannot make up for that. Ask whether the quote includes sealing or repairing ducts, and whether the company will test them.
What a careful installation looks like
Ask the company to walk you through its process. These are the steps that separate a clean job from a fast one.
- Refrigerant recovery. The old refrigerant is pumped into a recovery cylinder. Federal law under Section 608 of the Clean Air Act prohibits venting it, and the work calls for an EPA certified technician.
- Setting the equipment. The outdoor unit goes on a level pad with room for service. The matching coil or air handler goes in with a drain pan, and in an attic a secondary pan or float switch to catch an overflow before it reaches the ceiling.
- The line set. The copper lines are replaced, or confirmed suitable for the new refrigerant, then brazed and pressure tested.
- Evacuation. A vacuum pump pulls air and moisture out of the system, and a gauge confirms it holds before refrigerant goes in.
- Charge and airflow. The charge is set by the manufacturer's method and the blower speed matched to the design airflow.
- Hand-off. Thermostat set up, warranty registration explained, permit inspection booked.
Dallas AC replacement quote checklist
Two quotes for "a 3-ton system" can describe very different jobs. Lay this table beside every written quote. If a line is missing, ask for it before you sign anything.
| The quote should show | Why it matters | Warning sign |
|---|---|---|
| Full model numbers for the outdoor unit, the indoor coil or air handler, and the furnace if one is included | Lets you confirm the rating and that the parts belong together | A brand name and a tonnage, nothing more |
| AHRI reference number, SEER2 rating, and HSPF2 for a heat pump | Proves the matched rating and the federal minimum is met | "Around 16 SEER" with no reference number |
| How the size was chosen | Manual J and Manual S are the industry method | "Same as the old one" or a square-foot rule |
| Refrigerant type, and whether the line set is replaced or reused | The coil and lines must suit the new refrigerant | No mention of the coil or the copper |
| Duct work included, if any | Leaky attic ducts can waste a large share of the air | Silence on ducts for an attic system |
| City permit and inspection | Required in Dallas for replacing heating and cooling equipment | "You don't need a permit for a swap" |
| Electrical disconnect, pad, drain pan, float switch and thermostat | These are where surprise charges tend to appear | "Extras as needed" |
| Parts warranty and labor warranty, each in years | They are separate, and parts coverage can depend on registration | "Full warranty" with no terms |
| Any utility incentive, the program name and who files it | Oncor's program pays through participating contractors | A rebate promised with no program named |
| TDLR license number and a single total price | Texas rules require the license number on every proposal and invoice for AC work | No license number anywhere on the paperwork |
The line does not quote prices, and neither does this page. What moves the number is the efficiency tier, whether the coil, line set and ducts are part of the job, how hard the attic or closet is to work in, any electrical upgrade, and the permit. Comparing quotes line by line against this table is how you find out which one is actually the better deal.
Oncor incentives and the end of the 25C credit
Oncor is the largest energy delivery company in Texas. It owns the wires but does not sell power or send the monthly bill; in most of Texas that is the retail electric provider you choose. If Oncor delivers your electricity, its 2026 Home Energy Efficiency Standard Offer Program covers high-efficiency central air conditioners, central heat pumps and mini-splits in homes with active Oncor service. Homeowners do not apply on their own. Oncor pays a participating contractor, and the contractor passes the incentive on to the customer. The program manual calls for a photo of the AHRI certificate for each new system and a Manual J where the unit requires one, and it accepts paperwork until December 4, 2026 or until funds run out. Ask about it before the equipment is chosen, not afterward.
The federal Energy Efficient Home Improvement Credit, known as 25C, covered qualifying property placed in service before the end of 2025. A 2026 installation does not qualify. If a sales pitch still leans on that credit, the information is out of date.
Questions worth asking at the estimate
- Will you run a Manual J on my house, and can I keep a copy?
- Is repair still a reasonable option, and what would it cost?
- Are the outdoor unit and the indoor coil an AHRI-matched pair for the same refrigerant?
- What will you check, seal or replace in the ducts?
- Who pulls the city permit, and who meets the inspector?
- Do you take part in Oncor's program, and would this system qualify?
Pricing a replacement, or want a second opinion on a quote you already have? Call and say you are looking at a new system. You will be put through to an independent local HVAC company that serves your part of Dallas-Fort Worth.
- 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.
Related services and guides
- AC Repair
- Furnace and Heating Repair
- HVAC Tune-Up and Maintenance
- How to Choose an HVAC Company in Dallas
- Free AC Refrigerant Guide (PDF)
AC installation across Dallas-Fort Worth
Permit offices, electric providers and the age of the housing change from one city to the next. Each area page covers what is specific to that place.