Your AC replacement estimate
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Replacing only the outdoor condenser and indoor coil, and keeping a working furnace, is the lowest cost full cooling replacement in Austin. Most homes pay in the typical range below for a 3 to 4 ton system.
Cost jumps with tonnage, SEER2 rating, and duct or line-set work found during install.
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What AC replacement usually costs in Austin
| 2 to 2.5 ton, 14.3 SEER2 | $3,900 - $5,900 (Typical $4,800) |
| 3 to 3.5 ton, 15-16 SEER2 | $4,900 - $7,800 (Typical $6,400) |
| 4 to 5 ton, 17+ SEER2 / variable speed | $6,200 - $9,100 (Typical $7,900) |
| Add-on: line set, pad, disconnect, thermostat | Included - $900+ (Typical $300 to $700 if separate) |
Based on published Austin cost data. Updated October 15, 2026.
What drives the price in Austin
- Attic coil access: tight attic hatches and low clearance add labor in older Central Austin homes.
- Tonnage follows square footage and insulation, not the old unit label. Many Austin homes were undersized for current heat.
- Refrigerant transition: new R-454B equipment pricing and availability affect quotes in 2026. Ask which refrigerant the quoted unit uses.
Permit and code note
City of Austin mechanical permit is required for AC replacement. Contractor pulls the permit. Austin Energy code requires SEER2 compliance and a Manual J load check on full replacements in many cases. Keep the permit number in your records. No permit is a red flag.
Austin example
Example: a 1,800 sq ft Central Austin home with a 3.5 ton, 15 SEER2 system typically lands near $6,400. Tonnage by home size (rule of thumb): 1,200 sq ft: 2 to 2.5 ton. 1,800 sq ft: 3 ton. 2,400 sq ft: 3.5 to 4 ton. A Manual J load check decides the real size.
Frequently asked questions
Can I keep my old furnace?
Yes, if it is in good shape and matched to the new coil. A mismatched coil and condenser costs efficiency and can void warranty.
Coil-only vs full condenser match?
Replacing only the coil rarely pays. The condenser and coil are matched as a set. Replace both for rated efficiency.
How long does a swap take?
Usually 1 day for a straight swap. Duct or line-set work adds a day.
Sources
Ranges on this page come from published Austin cost guides (Angi Austin, Ja-Mar Austin 2026, Modernize, Texas Certified Restoration, AllBetter 2026). Estimates only, not quotes. Final price depends on size, access, and condition found on site.