How long does an AC unit last in Texas?

Most central AC systems in Texas last 10 to 15 years. Coastal humidity, hard water, and long cooling seasons shorten that compared to milder climates. Heat pumps tend to run a bit shorter because they work year-round.

Is it cheaper to repair or replace an old AC?

Use the 5,000 rule: multiply the unit's age by the repair quote. If the result is over $5,000, replacement usually wins on total cost of ownership. Below that, repair tends to be more economical, especially if the system is under 10 years old.

What SEER rating is required in Texas?

As of 2023, the Department of Energy minimum for new central AC in the Southern region (which includes Texas) is SEER2 14.3, equivalent to roughly SEER 15 under the older test. Most quotes today land between SEER2 15 and 18 for residential systems.

Do I need a permit to replace my AC in Texas?

Most Texas cities require a mechanical permit and inspection for full system replacements. Houston, Dallas, Austin, San Antonio, and Fort Worth all require it. The licensed HVAC contractor pulls the permit, not the homeowner.

HVAC · Updated April 2026

AC repair vs. replacement in Texas — when each one actually makes sense

A 14-year-old AC dies in mid-August. A tech tells you the compressor is shot, hands you a $4,200 repair quote, and an $8,400 replacement quote. What do you do? Here's how Texas HVAC pros actually think about it — and how to spot a quote that's padded.

The 5,000 rule (and why it usually wins)

The simplest decision tool in HVAC is the 5,000 rule:

Age of unit × cost of repair. If the result is over 5,000, replace. Under 5,000, repair.

A 14-year-old unit with a $400 repair = $5,600 — replace. A 6-year-old unit with a $700 repair = $4,200 — repair. It's not perfect math, but it's a fast sanity check that captures both age (the predictor of the next failure) and current cost.

Five signs it's time to replace, not repair

Compressor failure on a system over 10 years old. Compressor replacement is the most expensive single repair in HVAC. On an aging system, you're betting another major component holds.
R-22 refrigerant. R-22 was phased out in the U.S. on January 1, 2020. Existing R-22 systems can still be repaired with reclaimed refrigerant, but pricing has roughly tripled. Any R-22-related repair over $600 should trigger a replacement conversation.
Two or more major repairs in the past two cooling seasons. One repair is normal. A pattern is a signal.
Electric bills creeping up year after year with no change in usage. SEER ratings have improved dramatically; replacing a 10-SEER system with a SEER2-16 unit can cut cooling costs 30–40% in a Texas summer.
Humidity problems that won't go away. Texas summers are humid. An oversized or aging system short-cycles instead of dehumidifying, and no amount of duct cleaning fixes it. Modern variable-speed systems handle Gulf-Coast humidity dramatically better.

What a fair Texas AC replacement quote should include

For a typical 3-ton split system on a slab home in Houston, Dallas, Austin, San Antonio, or Fort Worth, expect a written quote to break out:

Outdoor condenser unit, model and SEER2 rating
Indoor coil or air handler, matched to the condenser
New refrigerant line set or flush of existing lines (mandatory when changing refrigerant types)
New thermostat (most quotes include a basic Honeywell or Ecobee)
Disposal of old equipment, including refrigerant recovery
Mechanical permit and city inspection
Labor warranty (at least 1 year) plus pass-through manufacturer warranty (typically 10 years on parts)

Lines you should question if they're missing: permit, labor warranty, and matched coil. A mismatched coil voids the manufacturer warranty.

Reasonable price ranges in Texas (2026)

These are ranges we see across the funnel calls in major Texas metros. Quotes outside the range aren't automatically wrong, but they deserve extra scrutiny.

2-ton split system, SEER2 15: $5,800 – $8,500 installed
3-ton split system, SEER2 15–16: $7,500 – $11,000 installed
4-ton split system, SEER2 15–17: $9,000 – $13,500 installed
3-ton heat pump, SEER2 16+: $9,500 – $14,500 installed
Compressor replacement (existing unit): $1,800 – $3,200
Capacitor / contactor (typical summer call-out): $180 – $450
Evaporator coil replacement: $1,200 – $2,400
Refrigerant leak diagnosis + minor repair: $400 – $900

Repair-first situations

Replace isn't always the answer. Repair is usually the right call when:

The system is under 8 years old.
The fault is a single, isolated component (capacitor, contactor, fan motor) and the rest of the system is sound.
It's an R-410A system (the post-2010 standard).
You're planning to sell within 2 years and won't recover replacement cost in the sale price.

One question that filters HVAC quotes fast

Ask: "What's the make, model, and AHRI certificate number for the combination you're proposing?" A real estimator has it. The AHRI number proves the indoor and outdoor units are tested to perform at the SEER2 you're paying for. Salespeople who can't provide it are either inexperienced or quoting equipment they don't actually plan to install.

FAQ

How long does AC last in Texas?

10–15 years for central AC; a bit shorter for heat pumps that run year-round.

Is repair or replacement cheaper?

Use the 5,000 rule. Above $5,000 (age × repair), replacement usually wins.

What SEER is required in Texas?

SEER2 14.3 minimum (Southern region) since 2023, equivalent to roughly SEER 15 old-test.

Do I need a permit?

Yes for full replacements in every major Texas metro. The contractor pulls it.