Abstract: The invention concerns a chamber (1) divided into two zones (11, 12) for preservation at different temperature, separated by a vertical mobile thermal barrier (10), capable of sliding horizontally and enabling said zones (11, 12) to exhibit modifiable dimensions as required. The meal trays (4) comprise, on opposite edges, notches (7) adapted to receive a removable insulating partition (8, 9) separating the meals (13) to be served hot from those to be served cold and whereof the position can be modified to correspond with that of the thermal barrier (10). Vertical sheaths (21) enable, by means of turbines, to circulate warm or cool air, through orifices (22). A valve (23) prevents the air in sheaths (21) from passing through the evaporator (18). Electric resistors (16) with fins are arranged opposite or beneath the meal trays (4). A refrigerating compressor (20, 20′), provided in a lower casing (2) or an upper casing (3), for cool air diffusion and circulation, feed the evaporator (18).