The short answer
A full residential AC system replacement in the DFW metroplex typically costs $6,000 to $12,000+. Most single-family homes land between $7,500 and $10,000 for a mid-efficiency system with standard installation. High-efficiency variable-speed equipment, extensive ductwork changes, or difficult attic access push quotes past $12,000.
| System size | Typical DFW range | Fits homes about |
|---|---|---|
| 2 to 2.5 ton | $6,000 - $8,500 | 1,200 - 1,600 sq ft |
| 3 to 3.5 ton | $7,500 - $10,500 | 1,600 - 2,400 sq ft |
| 4 to 5 ton | $9,000 - $12,000+ | 2,400 - 3,400 sq ft |
Typical ranges, not quotes. Equipment brand, efficiency rating (SEER2), and ductwork condition move every number.
What drives your quote up or down
- Efficiency rating. A 15 SEER2 builder-grade system costs thousands less than a 20+ SEER2 variable-speed unit. Higher efficiency pays back through lower summer electric bills, which in DFW add up fast.
- Ductwork. Leaky, undersized, or collapsing ducts add $1,500 to $4,000. Many quotes bury this; ask for it as a line item.
- Load calculation. A proper Manual J calculation sizes the system to your home. Contractors who skip it and size by "rule of thumb" routinely oversize, which short-cycles and wastes energy.
- Permits and code upgrades. Most DFW cities require a mechanical permit for changeouts. Electrical panel or drain-line upgrades add a few hundred dollars.
How to avoid overpaying
- Get three written quotes with equipment model numbers, not just tonnage.
- Ask each bidder for their Manual J summary. No calculation, no deal.
- Verify the Texas TDLR contractor license (TACLA/TACLB number) before signing.
- Compare 10-year parts and labor warranties, not just the sticker price.
Common questions
How long does AC replacement take?
One day for a straightforward changeout, two days if ductwork modifications are involved. A reputable crew protects your floors, hauls the old equipment, and walks you through the thermostat before leaving.
Can I replace just the outdoor unit?
Sometimes, but mismatched indoor and outdoor components lose efficiency and can void the manufacturer warranty. If the indoor coil is over 10 years old, replacing the full system usually costs less per year of service.
What SEER2 rating should I buy in Texas?
The federal minimum for our region (Texas sits in the DOE Southeast region) is 14.3 SEER2 for systems under 45,000 BTU and 13.8 SEER2 for systems of 45,000 BTU and up. In DFW's long cooling season, stepping up to 16 to 18 SEER2 can pay for itself in energy savings over several years, depending on your cooling load and electricity rates.
Do I need a permit to replace my AC in Dallas?
Yes, in Dallas and most surrounding cities. Your contractor should pull the mechanical permit as part of the job; confirm it is in the quote.
Sources
- ACDirect, "AC Unit Replacement Cost in Dallas, TX (2026)": acdirect.com: $4,400 to $12,000 installed, majority of 2.5 to 3 ton replacements $5,200 to $8,500.
- The Chill Brothers, "What Does AC Installation Cost in Fort Worth? 2026 Guide": thechillbrothers.com: $5,000 to $12,000 installed; standard replacements $7,500 to $13,500.
- Paschal Air, "SEER2 Overview: 2023 HVAC Energy Efficiency Regulatory Changes": gopaschal.com: 14.3 SEER2 minimum for residential central AC under 45,000 BTU in the Southeast region (including Texas), effective January 1, 2023.
- U.S. Department of Energy, 10 CFR 430.32(c)(1): govinfo.gov: federal minimums for split-system air conditioners installed in the Southeast region (including Texas): 14.3 SEER2 under 45,000 BTU, 13.8 SEER2 at or above 45,000 BTU.
Ranges checked September 2026. Typical installed costs, not quotes; your actual price depends on equipment, home, and installation conditions.