Replacement
Coil only or full system replacement?
Replace only the evaporator coil when it is leaking, the rest of the system is fairly young, a compatible coil is available and the warranty covers the part. If the system is past about 10 years, uses R-22, or the coil would not form a certified match, a full replacement is usually the better money. Published national prices put a coil at about $400–$2,500 installed; no Dallas-specific figure was found.
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What the coil is and why it fails
The evaporator coil is the indoor half of a split AC. It sits on top of the furnace or inside the air handler, and refrigerant flowing through it absorbs heat from the house air. The outdoor condenser releases that heat outside.
Coils most often fail from refrigerant leaks: small pinholes from corrosion, or a cracked joint. The usual sign is a system that needs refrigerant added every season. Refrigerant does not get used up, so a system that needs topping up has a leak somewhere, and the coil is a common place for it.
Topping up is not a repair
Under EPA’s Section 608 rules, refrigerant for these systems may be sold only to certified technicians or to employers of certified technicians. Repeated recharges cost money each time and leave the leak in place. Ask the technician to find the leak before deciding anything.
What a coil costs, and what it is compared with
| Job | Published range | Area and source |
|---|---|---|
| Evaporator coil, installed (1.5–3 ton) | $400–$2,500 | National; PickHVAC, page dated 2026-05-25 (Midwest labor assumption) |
| Midrange coil, 2–3 ton | $800–$2,200 | National; PickHVAC |
| Larger coil, above 3 tons | +$500–$1,200 | National; PickHVAC |
| 3-ton AC replacement (outdoor unit + coil) | $5,500–$16,500 | DFW; three contractor and cost pages |
No source we could rely on publishes a Dallas coil price. One Dallas cost calculator lists a coil figure, but it is a template estimate whose labor line reads zero, so it is not used here. PickHVAC itself says Sun Belt metros run above its Midwest assumption, so treat the national rows as a floor for orientation, not a Dallas number.
Warranty changes the math. Many manufacturers cover the coil part for years; then the bill is labor, refrigerant and the permit rather than the part. Ask what the warranty covers before comparing. Registration rules matter too: Trane extends its warranty term only if the product is registered within 60 days of installation; registered late, it keeps the base warranty.
The matching rule a coil swap has to pass
An outdoor unit can be installed in the Southeast only if at least one coil-only combination of that model meets the regional standard; a blower-coil rating alone does not qualify it.
In the Southeast the split-AC standard is enforced by installation date, not manufacture date, and DOE defines installation as connecting the refrigerant lines or electrical systems to make the system operational. In practice that means a replacement coil must form a certified combination with the existing outdoor unit, and on a newer system the coil normally has to use the same refrigerant.
- Ask for the AHRI certificate of the outdoor unit with the proposed coil.
- Check the refrigerant on the outdoor unit’s data plate. An R-22 system cannot take an R-410A or A2L coil as a simple swap.
- Ask whether the coil is cased and whether it fits the furnace or air handler without a new transition.
- Ask how the new coil is metered (TXV or fixed orifice) and whether that matches the outdoor unit.
Coil only, outdoor unit only, or the full system
| Situation | Usual answer | Why |
|---|---|---|
| System under about 8 years, coil leak, part under warranty | Coil only | Labor-only repair on a young system |
| System 10+ years, coil leaking | Full replacement | The outdoor unit is next; one visit, one permit |
| Any age, R-22 system | Full replacement | R-22 production has ended; coils and refrigerant are scarce |
| Outdoor unit failed, coil is the old refrigerant | Outdoor unit + coil (AC replacement) | A new outdoor unit needs a matched coil |
| Coil and furnace both old | Full system | The coil sits on the furnace; see the AC + furnace guide |
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.
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.
Why “just the outdoor unit” is rarely offered
The mirror-image question is replacing the condenser and keeping the old coil. On a system installed before 2023 the old coil was rated with an older outdoor unit and possibly an older refrigerant, so the pair may not be a certified combination under the 2023 rules. That is why most Dallas quotes for an “AC replacement” include the coil: in Texas, the installation-date rule makes the matched pair the safe default.
The SEER2 guide explains the rule; the AC replacement page covers the standard change-out.
Questions to ask before you approve a coil
- Where is the leak, and how was it found? Electronic detector, bubble test or dye: ask which.
- Is the coil part under warranty? Get the registration status and the part warranty term.
- What does labor, refrigerant and the permit add? Itemized, so you can compare it with a replacement quote.
- Will the new coil be a certified match? Ask for the AHRI number.
- How old is the outdoor unit, and what is its condition? A coil on a 14-year-old condenser buys a short reprieve.
- Is the contractor licensed? Check on the TDLR lookup.
Two hypothetical cases
A. Six-year-old system in Rowlett. Say the coil leaks, the system was registered and the part is under warranty. The coil-only repair is labor, refrigerant and the permit. That is usually the sensible choice.
B. Fourteen-year-old system in Richardson. Say the coil leaks and the warranty has lapsed. A coil at $800–$2,200 (national) goes on an outdoor unit already past ENERGY STAR’s 10-year marker. Most owners price the full change-out ($5,500–$16,500 for 3 tons, DFW) before deciding.
Illustrations from published ranges, not quotes. Your decision depends on what the technician finds.
Sources
- PickHVAC, AC coil replacement cost (National, page dated 2026-05-25) (retrieved 2026-10-20)
- 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)
- U.S. DOE, CAC regional standards guidance (16 December 2022) (retrieved 2026-10-20)
- U.S. DOE, 2023 Central Air Conditioner Standards FAQ (retrieved 2026-10-20)
- US EPA, Section 608 refrigerant sales restriction (retrieved 2026-10-20) — verify before relying on it
- US EPA, GreenChill regulatory context (archived page) (retrieved 2026-10-20) — verify before relying on it
- ENERGY STAR, "When is it time to replace?" (retrieved 2026-09-23)
- Trane, Warranty and Registration (retrieved 2026-10-20)
Questions
How much does an evaporator coil cost to replace?
Published national figures run about $400–$2,500 installed, with $800–$2,200 typical for 2–3 tons. We found no reliable Dallas figure. A part under warranty leaves mainly labor and refrigerant.
Can I replace just the coil on an R-22 system?
Usually not as a like-for-like swap: R-22 production ended in 2020, and a newer coil uses a different refrigerant. Most R-22 systems are replaced as a whole.
Does a new coil have to match the outdoor unit?
For the system to carry a certified rating, yes. Ask for the AHRI certificate of the outdoor unit with the proposed coil.
Is a leaking coil an emergency?
Not usually, but the system loses capacity as refrigerant leaks out. Get the leak located before the next recharge.
Next step
Free quote request
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