1. Foamed-in-place high density polyurethane insulation. 2. Automatic fan assisted evaporator. 3. Electronic controls temperature. automatic defrost. 4. Vapor-proof light. perimeter heater wire. 5. Spring actuated door closer. 6. Fan assisted condensing unit. 7. Interior and exterior are anodized aluminum. 8. Diamond plate and heavy duty reinforced. 9. Low noise compressor sets. 10.Deadbolt locking handle with independent key/pad. 11.All units are factory assembled. 12.Refrigeration system on wall mount. 13.Floor double sweep gasket. 14.Smooth aluminum interior floor (on models with floor). 15.Automatic condensate vaporizer. No drain line indoor units. 16.Digital thermometer.switch and pilot light. Warranty: One year all parts,6 years on compressor.