A refrigerated display unit (1), having an open-fronted cabinet providing a product display space (3) accessible through an access opening (39) provided by the open front. Cooling means (27) produces cold air to refrigerate items in the product display space (3). A cold air curtain is provided across the access opening (39) using a forwardly-positioned discharge outlet (5) communicating with a supply duct (45) and a forwardly-positioned return inlet (7) in communication with a return duct (41) receiving air from the air curtain (9). The air curtain (9) is substantially unsupported by any supplementary cooling airflow supplied into the product display space (3) separately from the air curtain (9).