If the compressor unit on your Avantco open-air merchandiser unit is damaged or not working properly, be sure to replace it immediately with this Avantco 18933208 compressor for MAC-26HC, MAC-36HC, and MCAC-36 series units. The compressor is incredibly important, as it circulates the refrigerant in the system under pressure, which concentrates the heat so that the whole unit does not become heated. A damaged will not be able to regulate the refrigerant's flow, and as a result, then unit may no longer blow cold air. This could cause your products to become warm or go bad, and you will end up spending more money in the long run.