System comprising a display unit (2, 1002) for storing and displaying food products, and multiple shelves, wherein the display unit has a front side and a back side, and comprises multiple walls, including a top wall, a left side wall, a right side wall, a bottom wall, and a back wall, and the display unit further comprises an air circulation system, and a first air refrigerator, in which the top, left side, right side, bottom, and back walls delimit an open front chamber for the food products, such that the chamber is accessible from the open front, the multiple shelves are placeable in the display unit to each extend in the chamber in a vertical spaced relationship, the air circulation system comprises a lower air duct with a lower front inlet, an upper air duct with an upper front outlet, and a first air forcing apparatus, the first air forcing apparatus is provided for moving air through the lower and upper air ducts (32, 34), from the lower front inlet towards the upper front outlet, the first air refrigerator is provided for cooling the air which is moved from the lower front inlet towards the upper front outlet, the upper front outlet is directed at the lower front inlet for creating a front air curtain in front of the open front, at least one of the multiple walls is a transparent wall, the display unit further comprises a conduit wall, which is positioned substantially in parallel to, and at the chamber side of, the transparent wall for creating an air conduit between the conduit wall and the transparent wall, the air conduit comprises a first conduit inlet, a second conduit inlet, and a conduit outlet, the first conduit inlet fluidly connects one of the lower and upper air duct (32, 34) with the air conduit for diverting a portion of refrigerated air moving through the one of the lower and upper air duct (32, 34) into the air conduit, the second conduit inlet fluidly connects ambient air outside of the display unit with the air conduit for letting in ambient air via the second conduit inlet into the air conduit between the transparent wall and the conduit wall such that the ambient air flows along the inside of the transparent wall, and the air conduit is configured to jointly guide the portion of refrigerated air and the ambient air from the respective first conduit inlet and second conduit inlet towards the conduit outlet for jointly exiting the air conduit from the conduit outlet. the top, left side, right side, bottom, and back walls delimit an open front chamber for the food products, such that the chamber is accessible from the open front, the multiple shelves are placeable in the display unit to each extend in the chamber in a vertical spaced relationship, the air circulation system comprises a lower air duct with a lower front inlet, an upper air duct with an upper front outlet, and a first air forcing apparatus, the first air forcing apparatus is provided for moving air through the lower and upper air ducts (32, 34), from the lower front inlet towards the upper front outlet, the first air refrigerator is provided for cooling the air which is moved from the lower front inlet towards the upper front outlet, the upper front outlet is directed at the lower front inlet for creating a front air curtain in front of the open front, at least one of the multiple walls is a transparent wall, the display unit further comprises a conduit wall, which is positioned substantially in parallel to, and at the chamber side of, the transparent wall for creating an air conduit between the conduit wall and the transparent wall, the air conduit comprises a first conduit inlet, a second conduit inlet, and a conduit outlet, the first conduit inlet fluidly connects one of the lower and upper air duct (32, 34) with the air conduit for diverting a portion of refrigerated air moving through the one of the lower and upper air duct (32, 34) into the air conduit, the second conduit inlet fluidly connects ambient air outside of the display unit with the air conduit for letting in ambient air via the second conduit inlet into the air conduit between the transparent wall and the conduit wall such that the ambient air flows along the inside of the transparent wall, and the air conduit is configured to jointly guide the portion of refrigerated air and the ambient air from the respective first conduit inlet and second conduit inlet towards the conduit outlet for jointly exiting the air conduit from the conduit outlet.