Abstract: A refrigeration apparatus having an improved antisweat heater structure for preventing condensation on the front surfaces of the stile and mullion portions of the apparatus cabinet at the access opening thereof selectively closed by a suitable door. The antisweat heater includes heater cable portions having different preselected values of resistance per unit length connected in series so as to develop selective differential heating effect at different areas of disposition thereof. In the illustrated embodiment, the heating effect is concentrated at the opposite ends of the mullion by providing the greater heating effect portions of the stile and mullion heaters adjacent that portion of the cabinet structure. In the illustrated embodiment, approximately one-third of the heating effect of each of the mullion and stile heaters is concentrated at each of the opposite ends of the heaters adjacent the ends of the mullion.