Service
AC replacement in Dallas
Replacing a central AC on existing ducts in Dallas is published at $5,500–$16,500 for a 3-ton system in 2026. A replacement usually means a new outdoor unit and a matched indoor coil, a permit and an inspection. Age, repair cost and refrigerant type decide whether it is time.
When replacement is worth pricing
Price a replacement when the system is old, the repair is large, or the refrigerant is obsolete. Any one of these is a reason to get a replacement quote alongside the repair quote; two or more usually settle it.
- Age. ENERGY STAR says to consider replacement when a heat pump or air conditioner is more than 10 years old, and that a correctly installed high-efficiency unit can save up to 20 percent on heating and cooling costs.
- The repair. A failed compressor or coil is a large repair on an older system.
- Refrigerant. Production and import of virgin HCFC-22 (R-22) ended on 1 January 2020; existing R-22 systems may still be serviced with recovered or stockpiled refrigerant.
- Repeat breakdowns or rooms that never cool, which can point to sizing or duct problems a replacement should fix.
Smaller failures are different. A capacitor, contactor or fan motor is a routine repair on almost any system, and replacing a working system because one of those failed is rarely the economical choice. The repair-or-replace guide walks through the decision in more depth.
Repair or replace: a decision table
| Situation | Lean | Why |
|---|---|---|
| Under 10 years old, small part failed | Repair | Routine parts on a system with life left |
| Over 10 years old, compressor or coil failed | Price replacement | A major repair on a system ENERGY STAR says to consider replacing |
| R-22 system with a refrigerant leak | Price replacement | Recharge refrigerant comes only from recovered or stockpiled supply |
| Works, but some rooms never cool | Inspect ducts first | The fault may be in the ducts, not the equipment |
| Furnace and AC both original | Price both together, and a heat pump | One project, one permit, matched equipment |
The table is a starting point, not a rule. Ask the repair technician to write down the system's age, the refrigerant, and the part that failed, so you can compare the repair cost with a replacement quote on the same terms.
Replacement cost by size
| Size | Published range | Sources |
|---|---|---|
| 2 ton | $7,500–$15,000 | 1 |
| 3 ton | $5,500–$16,500 | 3 |
| 4 ton | $7,500–$18,500 | 3 |
| 5 ton | $7,500–$20,000 | 3 |
AC-only replacement on existing ducts, DFW, 2026. Published third-party ranges, not this site's prices. Budget Heating's Dallas page puts most central AC replacements at about $6,700 to $12,000 installed.
The spread inside each size comes from efficiency tier, brand, how hard the attic or closet is to work in, and how much each source counts as part of the job. Sources with a single row for a size give narrower ranges than those that span entry and premium tiers. Use the table to sanity-check quotes, not to predict one.
What a replacement replaces
"Replace the AC" can mean three different jobs, and quotes for them are not comparable.
| Scope | What changes | When it fits |
|---|---|---|
| Condenser only | Outdoor unit | Rarely; only if the existing coil is rated with the new unit and uses the same refrigerant |
| AC system | Outdoor unit, indoor coil, often the line set | The usual Dallas replacement when the furnace has years left |
| Full system | AC plus furnace or air handler | Both are old, or switching to a heat pump |
Ask each contractor to name the scope in writing. If one quote is AC-only and another is full system, the price gap says nothing about value.
The coil and the refrigerant
Equipment made or imported since 1 January 2025 uses lower-GWP A2L refrigerants (R-454B or R-32) instead of R-410A. An EPA rule finalized in May 2026, effective 27 July 2026, removed the 1 January 2026 cutoff, so contractors may install pre-2025 R-410A systems until that stock runs out.
A new outdoor unit on an old coil may not be a matched system. Ask for the AHRI certificate number for the exact combination quoted. The SEER2 rating on the brochure applies only to a combination listed together.
The old refrigerant has to be recovered, not vented. Under EPA’s Section 608 rules, refrigerant for these systems may be sold only to certified technicians or to employers of certified technicians. Ask who recovers it and whether that is in the price. If the line set is being reused, ask whether it will be flushed or checked for the new refrigerant. The refrigerant guide covers the trade-offs between R-410A stock and A2L systems.
Ducts and electrical
ENERGY STAR estimates that about 20 to 30 percent of the air moving through a typical duct system is lost to leaks, holes and poorly connected ducts. Sealing or repair is published in Dallas at $1,300–$8,000. Full new ductwork for about 2,000 square feet is published at $6,000–$7,000 on an undated Dallas page.
A replacement is the cheapest moment to fix the ducts, because the crew is already in the attic and the airflow can be measured with the new equipment. A new system on leaky attic ducts still loses cooled air to the attic. See ductwork replacement and sealing.
A larger system or a heat pump can need a new breaker or, in older homes, a panel upgrade, published nationally at $1,800–$3,500. Ask whether the existing disconnect and wiring are reused and whether they match the new unit's rating.
Worked examples
Hypothetical houses, built from the published ranges, to show how scope moves the total. They are not quotes.
A 12-year-old 3-ton with a failed compressor
Say a Richardson ranch house has a 3-ton R-410A system past ten years old, and the compressor has failed. The furnace is newer and the ducts were sealed recently. An AC-only replacement on those ducts is published at $5,500–$16,500 in DFW. The repair quote for the compressor now has to be weighed against that range and the system's age.
A 4-ton with ducts that need replacing
Say a 1980s Mesquite house needs 4 tons and the attic ducts are crushed and leaking. The 4-ton DFW range is $7,500–$18,500; adding published Dallas new ductwork ($6,000–$7,000) gives roughly $13,500–$25,500. The ductwork figure comes from an undated page, so treat it as indicative.
A 3-ton in an older house on a small panel
Say a 1960s Dallas house moving up to a new 3-ton system needs a 200 A panel. The DFW 3-ton range plus the national panel upgrade range ($1,800–$3,500) gives about $7,300–$20,000. If both furnace and AC are old, a DFW heat pump ($6,500–$14,500) is worth pricing in the same visit.
Timing in a Dallas summer
Average first 100 °F day: July 1. Average last: August 27. DFW averages about 20 days a year at or above 100 °F. A failure in that window leaves little time to compare quotes, which is when buyers accept the first price.
- If the system is old but working, get replacement quotes in spring or fall, when you can wait for a slot and compare properly.
- If it fails in July, ask whether a temporary repair can keep it running while you collect two or three quotes.
- Either way, do not let urgency skip the load calculation, the AHRI match or the permit.
Replacement day
Trane puts a straightforward installation at about 4 to 8 hours. Ask who recovers the old refrigerant and hauls the old unit away; both belong in the written scope.
- Power off and recovery. The old refrigerant is recovered and the old equipment disconnected.
- Removal. The condenser, coil and any parts being replaced come out.
- Set and connect. New equipment goes in; the line set is connected or replaced, and the drain, pan and disconnect are fitted.
- Evacuate and charge. The system is pulled into a vacuum, then charged to the manufacturer's specification.
- Start-up. Airflow and temperature split are checked and the thermostat is set up.
After the install, ask for the permit number and the final inspection date, and see what to check afterwards. Trane extends its warranty term only if the product is registered within 60 days of installation; registered late, it keeps the base warranty. Lennox requires registration within 60 days of installation (or closing, for new construction) for its extended limited warranty. Ask who registers the equipment and get the confirmation.
Plan ahead with how to prepare, and what happens on replacement day.
Common mistakes
- "Same size as the old one." Dallas enforces the 2021 International Residential Code and 2021 IECC with Dallas amendments, effective 12 May 2023. The IRC requires equipment to be sized from a load calculation (ACCA Manual J) rather than a rule of thumb.
- Mismatched equipment. A new condenser on an old coil can miss its rating and complicate the warranty.
- Skipping the ducts. Replacement is the cheapest time to seal or fix them.
- Missing the warranty window. Some manufacturers extend coverage only if the system is registered within 60 days.
- Signing under pressure. Under Texas Business and Commerce Code §601.051, a consumer may cancel a consumer transaction until midnight of the third business day after signing, where the sale was solicited and agreed somewhere other than the merchant’s place of business and the price is over $25.
- No permit. Without the inspection, nobody independent checks the work.
What to ask
- Are you replacing the coil, and what is the AHRI match number?
- Which refrigerant does the new system use?
- How did you size it? "Same as the old one" is not a load calculation.
- Is the line set new or reused, and how is it checked?
- Did you inspect the ducts, and what would sealing them cost?
- Does my panel or disconnect need work?
- Who pulls the permit, and is the fee included?
- What is the labor warranty, and who registers the equipment warranty?
- Is your TDLR license number on the proposal and invoice?
Line up the answers with the quote comparison tool and check the contractor on the TDLR license lookup.
Sources
- Cold Factor Heating & Air (Flower Mound, TX) (page dated 2026) (retrieved 2026-09-23)
- HVAC Services Pro (DFW) (page dated 2026-04-13) (retrieved 2026-09-23)
- HVAC Services Pro, DFW installation guide (page dated 2026-03-06) (retrieved 2026-09-23)
- HVACProjectCost.com, Dallas page (page dated 2026-08-02) (retrieved 2026-09-23)
- Budget Heating, AC replacement cost in Dallas (Dallas, page dated undated) (retrieved 2026-10-20)
- Budget Heating, furnace replacement cost guide (National, page dated 2026 (title)) (retrieved 2026-10-20)
- HVAC.com, HVAC replacement costs in Dallas, TX (Dallas, page dated 2024-05-22) (retrieved 2026-10-20)
- Voltflow, electrical panel upgrade cost 2026 (National, page dated 2026-04) (retrieved 2026-10-20)
- Trane, how long does it take to install an AC unit (National, page dated 2025-07-16) (retrieved 2026-10-20)
- ENERGY STAR, "When is it time to replace?" (retrieved 2026-09-23)
- NAHB summary of the EPA final rule (May 2026); EPA AIM Act Technology Transitions program (retrieved 2026-09-23)
- US EPA, GreenChill regulatory context (archived page) (retrieved 2026-10-20) — verify before relying on it
- US EPA, Section 608 refrigerant sales restriction (retrieved 2026-10-20) — verify before relying on it
- ENERGY STAR, "Duct Sealing" (retrieved 2026-10-20)
- NWS Fort Worth, "DFW 100° Info" (retrieved 2026-09-23)
- National Weather Service Fort Worth, "DFW 100° Day Data" (retrieved 2026-09-23)
- Texas Business and Commerce Code ch. 601 (retrieved 2026-10-20)
- Trane, Warranty and Registration (retrieved 2026-10-20)
- Lennox, Extended Limited Warranty FAQ (retrieved 2026-10-20) — verify before relying on it
- City of Dallas, "Current City Code" (retrieved 2026-09-23) — verify before relying on it
- 16 Tex. Admin. Code §75.71 (license number on proposals and invoices) (retrieved 2026-10-20)
Questions
How much does AC replacement cost in Dallas?
Published 2026 DFW ranges for replacing the outdoor unit and coil on existing ducts run $5,500–$16,500 for 3 tons and $7,500–$18,500 for 4 tons. Replacing the furnace too, or the ducts, adds to that. These are third-party ranges, not this site's prices.
Should I replace the indoor coil when I replace the AC?
Usually, yes. The outdoor unit and indoor coil are rated as a matched pair, and a new refrigerant (R-454B or R-32) generally needs a coil designed for it. Ask the contractor for the AHRI-matched model numbers.
Can I reuse my existing ductwork?
Often, if the ducts are sized for the new system and do not leak badly. ENERGY STAR estimates typical duct systems lose 20 to 30 percent of the air they move. Ask for a duct inspection with the quote.
Is an R-22 system worth repairing?
R-22 production and import ended in 2020, so recharge refrigerant comes only from recovered or stockpiled supply. A major R-22 repair is often the point to price a replacement.
Can I replace just the outdoor unit?
It is sometimes quoted, but the new condenser may not be AHRI-matched to the old coil, and the refrigerants may differ. Ask whether the combination is rated together, and what that does to the efficiency and the warranty.
Should I replace the furnace at the same time?
Price it both ways if the furnace is old. The coil sits on the furnace, and doing both in one visit shares labor and the permit. A furnace plus 3-ton AC together is published nationally at $10,500–$13,500.
Can I cancel a replacement contract after signing?
If the sale was solicited and agreed at your home, not the merchant's business, and is over $25, Texas law lets you cancel until midnight of the third business day after signing. Read the contract's cancellation notice.
Next step
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