cost to replace ac coil
1 The price for replacing air conditioner coils depends on the particular unit of the air conditioner. 2  The central AC unit size is basically the biggest determinant for the coil replacementâs price. 3  The price for 1.5 ton will differ from higher unit sizes such as 2.5, 4 and 5 ton coils. HeatingAndCoolingWarehouse.com gives the price for the coil of each unit size. 2  Two-ton coil, for example is priced around $239 while a 2.5-ton coil costs $259. 3  As expected the price goes higher as the unit size increases. 4  In fact, a 5-ton coil costs $499. 5  But again, these prices do not include the installations costs.