Sub-Zero Freezer Company Inc. is an American manufacturer which builds refrigerators, wine coolers and freezers. Sub-Zero brand name is known for superior quality, reliability and high-performance. It is one of the best brands of refrigerators and freezers in the world. The company started in 1945 soon after Westye F. Bakke made his first freestanding refrigerator. Sub-Zero is the only refrigerator manufacturer which uses the dual-refrigeration technology in their refrigerators. This system allows both freezer and refrigerator to maintain very accurate consistent temperatures to keep food fresher for longer and helps homemakers avoid food spoilage. The dual refrigeration system also means there is no transfer of fresh food odors to frozen food or ice as the refrigerator does not freeze the moisture out of the air in the fresh food section. Although both compressors work simultaneously, the whole system is more energy-efficient then single compressor refrigerators. A heavy price tag is probably the only one disadvantage when purchasing a refrigerator made by sub-Zero.