Should You Replace Your Old Sub-Zero 500/600 Series?
Sub-Zero 500 and 600 series refrigerators have been serving homeowners for many years. As great as they are (some are still running quite well), there are more energy-efficient models available today. Newer refrigerators are quieter thanks to upgraded compressors. Some even include air purifiers that filter odors, bacteria, and mold to keep food fresher.