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Aluminum coils are very difficult to maintain and almost impossible to repair. Copper coils are the standard, and more durable, though they tend to also be more expensive. A broken condenser coil may be first noticed if the air from the AC is coming out hotter than what is indicated by the thermostat.
Copper coils use up to 3 times as much of the material as aluminum coils, making them a more expensive option. Replacing a condenser coil can cost $500 to $750.
Costs vary greatly by region (and even by zip code). To get free estimates from local contractors, please indicate yours.