An ac condenser coil replacement Part is a crucial component in any HVAC system. It is located outside the home and is responsible for releasing heat from the refrigerant, which is a key step in the cooling process.When the refrigerant passes through the tubes, it releases heat, which is then dissipated into the air by the fins. The refrigerant is also cooled as it passes through the coil, preparing it to re-enter the AC system and continue the cooling process.