An AC disconnect box costs $150 to $500 with installation. The National Electric Code (NEC) requires the installation of a disconnect box within sight of the outdoor condenser unit. While servicing the AC, the technician flips the disconnect switch to cut electricity to the AC system for safety. An air conditioner recharge costs $100 to $320 on average for AC units with R410A refrigerant or $180 to $600 for older AC units using R22 Freon. Here's more information regarding her comment is here ...