Local buying guide
DFW AC replacement guide
A scope-first guide to sizing, efficiency, ducts, permits, warranties, and commissioning in North Texas.
Direct answer
Direct answer
Think of a DFW AC replacement as two things: a matched system and a plan for installing it. You'll want home-specific sizing, the exact indoor and outdoor model numbers, and an AHRI certified match (proof the two units were lab-tested together). Then get the site work in writing too, the drains, the line set, electrical work, controls, old-equipment removal, permits if they apply, commissioning (the startup testing), and warranties. Line those rows up before you compare proposals. ENERGY STAR calls out proper sizing, duct condition, airflow, and refrigerant charge as core quality-installation concerns, and a shiny efficiency label can't make up for an installation that skips them.
Key takeaways
- Don't let anyone size the system off square footage, the old nameplate, or a bigger-is-better hunch, ask for a home-specific sizing explanation instead.
- Check the exact indoor/outdoor combination and its certified ratings in the AHRI directory yourself, rather than trusting a product-family maximum.
- Get every site item, startup measurement, exclusion, warranty, and responsible party written into the signed scope.
Define the comfort problem before selecting equipment
Before anyone talks equipment, write down what's actually bugging you: rooms that run warm or cool, humidity, noise, filtration needs, and how the thermostat behaves. Add any big changes to the house or how it's used, additions, replaced windows, insulation or air-sealing work, and any ducts running outside conditioned space. This record pushes the bidder to investigate your house instead of just cloning whatever's there now. Regional climate shapes the design assumptions, but it can't pick a tonnage or equipment type for your specific home, so ask which observations were actually measured and which were assumed.
Sources: [energy-star-qi], [nws-dfw]
Require a home-specific sizing rationale
ENERGY STAR's quality-installation guidance leans hard on correct sizing, and points out that oversized equipment tends to cycle on and off too often, which hurts comfort. Ask how they ran the load calculation: the method, the indoor and outdoor design conditions, the home inputs, and the sensible and latent loads, the heat and the moisture the system has to remove, and how the proposed equipment covers them. The old nameplate and your floor area can feed that investigation, but they aren't a finished calculation on their own. Ask the bidder to walk you through any shaky assumptions and how planned envelope work would shift the choice.
Sources: [energy-star-qi]
Verify the exact matched system and ratings
Write down the full model numbers for the outdoor unit, the indoor coil or air handler, the furnace if there is one, the thermostat, and any major accessories. Ask for the AHRI Certified Reference Number and look it up yourself in AHRI's public directory. Confirm the listed components match your proposal, and note the certified cooling capacity and efficiency ratings for that exact combination. A brochure's ‘up to’ number often describes a different match entirely. Keep in mind this check confirms certified product performance, it doesn't grade the installer or promise a certain energy bill in your home.
Sources: [ahri-directory]
Make ducts and airflow part of the decision
Even brand-new equipment still has to breathe through your existing return, filter, blower setup, supply ducts, and room-by-room distribution. Ask what they inspected or measured, how much airflow the proposed system needs, whether your filter and returns can actually feed it, and which sealing, resizing, balancing, or insulation work is in the price. ENERGY STAR treats duct condition and airflow as installation-quality issues, not afterthoughts. If nobody proposes any duct correction, ask what evidence says your current ducts are fine rather than taking it on faith.
Sources: [energy-star-qi], [energy-star-maintenance]
Normalize all work outside the equipment boxes
Go line by line and mark each row as included, excluded, an allowance, not applicable, or not stated. If a bidder writes ‘as needed,’ ask them to turn that into a defined task or a documented change-order process. Permit and inspection rules vary by property and city, so confirm who's responsible with your local authority rather than assuming one DFW-wide rule covers everyone.
| Scope area | What to document | Decision question |
|---|---|---|
| Refrigerant circuit | Line-set reuse/replacement, insulation, recovery, evacuation, charge verification | Who owns hidden-condition changes? |
| Air and water | Duct transitions, filter, drains, overflow protection, pad or stand | What existing conditions were checked? |
| Electrical/controls | Disconnect, circuit assumptions, thermostat, sensors, configuration | What is included or assigned elsewhere? |
| Project | Removal, access protection, permit if required, inspection, cleanup, restoration | Which party is responsible? |
| Commercial | Cash total, allowances, exclusions, payment, warranties, change orders | What can change the signed total? |
Sources: [energy-star-qi], [epa-608], [tdlr-acr]
Compare efficiency without promising a utility result
Certified efficiency is genuinely useful when you're comparing two exact AHRI matches, but it isn't a forecast of your bill. Your actual usage depends on the weather, how you set the thermostat, your ducts, airflow, equipment sizing, the envelope, how many people live there, utility rates, and the installation itself. The NWS 1991–2020 DFW normals report 2,825 annual cooling degree days and, on average, 20.2 days a year with highs of at least 100°F, that's cooling-season context, nothing more. So weigh the certified ratings alongside capacity control, your comfort goals, the installation scope, and the total economics, and don't treat climate normals as either a diagnosis or a savings guarantee.
Sources: [ahri-directory], [energy-star-qi], [nws-dfw]
Specify the commissioning and the homeowner handoff
Before you sign, ask which commissioning results, the startup test readings, will be recorded and handed to you. A useful report ties the installed model and serial numbers to the thermostat configuration, the airflow (or an approved way to verify it), the external static pressure where it applies, basically how hard the blower is fighting your ducts, plus temperature readings, refrigerant-charge verification under the right conditions, the drains, safety controls, and any staging or modulation. ENERGY STAR flags airflow and refrigerant charge as installation-quality elements. The exact procedure has to follow the equipment instructions and stay technician work. While you're at it, ask for the filter specs and some plain operating guidance.
Sources: [energy-star-qi], [epa-608]
Verify the contractor and clarify refrigerant responsibility
Search the contracting business or the license info you were given in TDLR's official database, then compare it against the entity named on the proposal. Ask who's responsible for the regulated work and who handles callbacks. On the refrigerant side, the scope should cover recovering refrigerant from the removed equipment, any leak-related work, and compliant handling throughout. EPA Section 608 bans intentionally venting regulated refrigerants and sets requirements for covered activities. This is not a DIY area, leave line-set disconnection and refrigerant work to the professionals.
Sources: [tdlr-acr], [tdlr-license], [epa-608]
Keep a complete closeout file
Before you call the job closed, reconcile the installed model and serial numbers against the signed proposal, and collect the AHRI certificate, the final invoice, any approved change orders, the startup report, the permit or inspection record when it applies, and every equipment, labor, and workmanship warranty document. Confirm who completes any required manufacturer registration, and keep the proof rather than trusting a verbal promise. Jot down any comfort items that aren't resolved yet and how they'll be corrected. These documents make future service and warranty conversations far easier.
Sources: [ahri-directory], [energy-star-qi], [tdlr-acr]
Decision checkpoint
| What you know | What to ask next |
|---|---|
| The home's documented comfort issues and the bidder's load-calculation inputs. | How does the selected capacity address the calculated sensible and latent loads? |
| The exact component model numbers and claimed performance. | Does the AHRI directory show this exact match and the same certified ratings? |
| The quoted total and listed equipment. | Which duct, drain, electrical, refrigerant, control, permit, commissioning, and warranty items are included or excluded? |
Common questions
Frequently asked questions
Should a replacement AC have the same capacity as the old one?
Not automatically. The old size can be informative, but home changes and past sizing mistakes matter. Ask for a home-specific load calculation and an explanation that connects the result to the exact system being proposed.
What does an AHRI certificate prove?
It identifies a certified equipment combination and its listed performance. Confirm the model numbers match your quote and the actual installation. It doesn't certify the workmanship, the duct adequacy, the contractor's quality, or the savings in your home.
Is the highest efficiency rating always the best choice?
No single rating wins every home. Weigh the exact match, the sizing, the ducts, your comfort goals, the controls, the full installation scope, the warranty terms, and the economics together. Be skeptical of any household savings claim that rests on the rating alone.
Can my existing ducts stay?
Possibly, but ask for evidence. The contractor should check whether your returns, filter, supplies, leakage, insulation, and system resistance can support the proposed airflow, then put any correction or acceptance in writing.
Who should handle old refrigerant during replacement?
Qualified personnel should recover and manage the refrigerant under the applicable EPA requirements. As the homeowner, don't disconnect tubing, connect gauges, vent refrigerant, or try to dispose of charged equipment yourself.
What should I receive after installation?
Keep the final scope and invoice, the model and serial records, the AHRI certificate, the startup measurements, any approved changes, the permit and inspection record when it applies, warranty and registration proof, the filter spec, and the operating instructions.
Continue your decision
Sources
- ENERGY STAR, HVAC Maintenance ChecklistOfficial homeowner and professional maintenance guidance covering filters, electrical checks, condensate drains, coils, refrigerant charge, and airflow.
- ENERGY STAR, HVAC Quality InstallationOfficial quality-installation guidance addressing sizing, ducts, airflow, and refrigerant charge.
- U.S. EPA, Managing Refrigeration and A/C EquipmentFederal requirements and owner guidance for refrigerant recovery, handling, leaks, and equipment disposal.
- Texas Department of Licensing and Regulation, Air Conditioning and RefrigerationOfficial Texas air-conditioning and refrigeration licensing, rules, enforcement, and consumer-information portal.
- Texas Department of Licensing and Regulation, License SearchOfficial lookup for current Texas license records; verify the record and entity rather than relying on a badge or advertisement.
- AHRI, Directory of Certified Product PerformancePublic directory for checking certified ratings of exact indoor and outdoor equipment combinations.
- National Weather Service Fort Worth/Dallas, DFW Climate Records and NormalsOfficial DFW climate normals and records. Climate context does not diagnose a particular home or HVAC system.