The evaporator is one of the two (maybe three) heat exchangers in a mobile A/C system. It is usually made up of aluminum, and somehow similar with radiator, but unlike the radiators the passages in the evaporator carry moving refrigerant. The cold, low-pressure liquid refrigerant enters the evaporator whereas the warm air passes through the evaporator by action of the blower fan from the interior of the vehicle. Since the nature of facts says that heat always travels from a warmer area to a cooler area, so the cooler refrigerant flowing inside the evaporator’s absorbs heat from the warm air. At the same time, in the air condenses the humidity cools on evaporator’s surface, and then eventually it drips out of a drain tube to outside the vehicle. After the (now slightly warmer) refrigerant has completed its path through the evaporator, it takes its next destination towards the compressor.
In other words air conditioning does not actually cool the interior of the vehicle. But it does remove the heat and humidity from it.
However there are some industries which manufacture the best quality A/C Evaporator i.e American Standard, Lennox, Carrier, Trane, Amana, Luxaire, Fujitsu, etc.