A new compressor run capacitor can range from $250 to $350 depending on the size and air conditioning contractor. The cost to replace your air conditioning compressor can range from $1500 to $2400.eplacing the motor without the same specs can cause higher utility cost and a shorter life span of the air conditioning system. Also replace the run capacitor when you replace the condenser fan motor. The average cost to replace the condenser fan more can range from $350 to $575.