Refrigeration system with enveloping air circulation around product chamber

A method for operating a refrigeration system comprising:

• providing a storage chamber to store a product at a predetermined temperature, the storage chamber defined by an inner wall, the inner wall at least partially defining an air plenum, the inner wall including an opening wall surface, a floor surface, a rear wall surface and a ceiling wall surface;
• providing a refrigerant circuit including a compressor, a condenser, a condenser fan, an evaporator and an evaporator fan arranged and disposed in an operable configuration to provide refrigeration to the storage chamber;
• conveying air from an air inlet, in the air plenum, across the evaporator and into a discharge chamber and out an air outlet, the air outlet being configured to discharge cooled air in a direction toward the opening wall surface;
• discharging cooled air in a direction toward the opening wall surface through the air outlet, the air outlet being positioned at the top of the storage chamber no farther than 12 inches from the opening wall surface and no closer than ½ inch from opening wall surface.