Abstract: A low temperature food merchandiser having a cabinet with an open front product area, a primary cold air system for maintaining substantially constant frozen food temperatures of 0.degree. F. or ice cream product temperatures of -5.degree. F. in the product area including the formation of a series of vertical curtains of primary low temperature air extending across the open front of discrete product area sections, a secondary air system protecting the primary air curtains, and the primary system also including primary evaporator means constructed and arranged to operate at elevated coil temperatures in the range of -5.degree. F. to -8.degree. F. to maintain 0.degree. F. product temperature or coil temperatures of -12.degree. F. to -15.degree. F. to maintain -5.degree. F. product temperatures, and including high efficiency reverse air cycle defrost means for periodically defrosting the primary cooling means.

Abstract: A low temperature food merchandiser having a cabinet with an open front product area, a primary cold air system for maintaining substantially constant low temperatures of at least 0.degree. F. in the product area including the formation of plural primary low temperature air curtains across the open front, a secondary air system protecting the primary air curtains, and the primary system also including primary evaporator cooling means constructed and arranged to operate at elevated coil temperatures in the range of -5.degree. F. to -2.degree. F. to maintain the 0.degree. F. product area temperature, and including reverse air cycle defrost means for periodically defrosting the primary cooling means.