A microprocessor temperature control system features digital temperature display and a set-point security system. The air-cooled cascade refrigeration system includes a down feed evaporator, high-capacity air-cooled condenser and two air-cooled compressors. In addition, the system offers 100% CFC-free refrigerants and a low 47 dba noise rating. A microprocessor-controlled alarm system provides battery backup and remote alarm contacts. Additional features include heavy duty swivel casters, 3 adjustable shelves, multi-point gasket seals and claw-like inner door latches.