Evaporator coil replacement cost most often lands between $600 and $2,500 for a typical home. However, it can reach $4,500 or more on a large, older, or out-of-warranty system. The evaporator coil is the indoor part of your air conditioner.
Refrigerant flows through it and absorbs heat and moisture from your home's air. When the coil leaks or corrodes, the system stops cooling. The repair is expensive because it opens the sealed refrigerant circuit.
This guide breaks the bill into parts, and refrigerant, and shows what pushes the price up or down. It then explains how to get a quote you can trust. It also answers the question behind most searches: is a new coil worth paying for, or should you replace the whole unit?
Modern HVAC Tech has repaired and replaced cooling systems in Chicago and the north suburbs for more than twenty years.
The new coil for AC unit cost, meaning the part alone, runs roughly $300 to $1,100. The part is never the whole bill, though.
| Line item | Typical range |
| Coil (part only) | $300 to $1,100 |
| Refrigerant recovery and recharge | $150 to $400 |
| Diagnosis or service call | $75 to $200 |
Note: The above made range is estimate and actual range may vary
Tonnage is the biggest driver because larger systems need larger coils and more refrigerant. You can find your system's tonnage on the outdoor unit's nameplate or in its model number. These are typical totals.
| AC unit size | Typical total cost |
| 1.5 to 2 ton | $1,000 to $2,000 |
| 2.5 ton | $1,500 to $2,500 |
| 3 ton | $1,800 to $3,000 |
| 3.5 ton | $2,000 to $3,500 |
| 4 ton | $2,300 to $4,000 |
| 5 ton | $2,800 to $4,500+ |
Note: The above tonnage and range give are estimates and actual range may vary
Most single-family homes run a 2 to 3.5 ton system, so budget $1,000 to $3,500 unless something unusual is going on.
Premium brands such as Trane, Lennox, and Carrier use proprietary coil designs that cost more than Goodman or Rheem equivalents. A-coils are the most common and cheapest style.
By contrast, N-coils and Z-coils cost more, and cased coils cost more than uncased ones.
Access matters as well. A coil in a tight closet, attic, or crawl space can add labor hours.
Therefore, ask where your coil sits before you compare quotes.
You get an accurate quote by confirming the coil is truly the failed part and knowing four facts about your system. That can save you from paying for a coil you did not need.
To start, many coil symptoms have cheaper causes. Weak airflow, ice on the lines, and warm air from the vents can come from a dirty filter, blocked return vents, or a low refrigerant charge. A true coil failure usually shows up as a confirmed refrigerant leak, an oily residue near the indoor unit, or a hissing sound at the air handler.
Next, a technician should confirm the leak with UV dye, an electronic detector, or a nitrogen pressure test. Our service call fee at Modern HVAC Tech is $135, and a proper diagnosis costs far less than replacing the wrong part.
Request a written, itemized quote and ask these questions:
Above all, do not attempt this yourself. Replacing the coil requires recovering refrigerant, and technicians who handle it need EPA Section 608 certification. In addition, venting refrigerant is illegal, and an improper job can void your warranty.
Replace the coil when the system is young, uses R-410A or newer refrigerant, and passes the $5,000 test below. Past roughly 10 years, or with any R-22 system, a full air conditioner replacement usually makes more sense.
Use the $5,000 rule. Multiply the coil quote by the system's age in years. If the result tops $5,000, replacement is the better spend. Then compare the coil quote with the new AC unit cost, since a complete split system commonly runs $5,000 to $12,000 depending on type and size.
If the system is old, the coil quote is not buying you a new system's lifespan.
In fact, a coil that has leaked once often leaks again, because the metal tubing is thinning. A new coil on an old system also has to match the outdoor unit. A mismatched coil and condenser can cut efficiency and put warranties at risk. When the outdoor unit and coil are both near the end of their life, replace them together.
Meanwhile, the compressor is usually the single most expensive AC part, at roughly thousands with parts and labor. If a leak has been running for a while, ask the technician to check the compressor before you commit to either choice. If you decide on a new system, ask them about financing options.
Two factors can swing your bill by thousands: whether a manufacturer warranty still covers the coil, and whether your system runs on R-22 refrigerant. Check both before you accept a quote.
A manufacturer's parts warranty typically lasts 5 to 10 years and covers the coil itself. Labor is usually not covered, so plan for refrigerant plus additional hundred. Many warranties also require registration within 60 to 90 days of installation, so find your registration confirmation before assuming you are covered.
R-22 production and import ended on January 1, 2020, and older systems, generally built before 2010, may still use it. Because the supply is reclaimed stock, R-22 costs many times more per pound than R-410A, and a full recharge on a 3-ton system can add hundreds of dollars to well over a thousand.
The all-in price of an R-22 coil job often reaches $2,000 to $4,500 or more. At that price, with an aging system, replacing the whole unit is almost always the better buy. Converting to a substitute refrigerant is possible but carries pressure and compressor-oil risks that most contractors avoid.
Evaporator coil replacement makes sense on a young, well-kept system, and on an older system or one running R-22 the same money is better spent toward a new unit. Confirm the diagnosis first and run the $5,000 rule on your quote before you decide. The cooling season is over for this year, so fall is also a quieter time to book the work.
If your AC has stopped cooling and you want an honest answer on which route fits your home, book an AC repair diagnosis with Modern HVAC Tech. We serve Chicago and the north suburbs.
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Plan on two to four hours for a typical job, and anywhere from five to ten hours when the coil sits in a hard-to-reach attic or crawl space.
Yes, but cleaning only fixes dirt-related airflow and efficiency problems. A coil that is leaking refrigerant has to be replaced.
The evaporator coil sits indoors on your air handler or furnace and absorbs heat from your home's air. The condenser coil sits in the outdoor unit and releases that heat outside. This guide covers the indoor coil.
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