Your commercial HVAC or refrigeration compressor is the backbone of your entire cooling system. When it goes down, the whole system will undoubtedly fail. Unfortunately, many people ignore the signs of compressor failure instead of acting to save the compressor from further damage. Part of the reason is that they simply don't know what their compressor is trying to tell them. Here are a few clues to help you keep an eye on your commercial compressor, and know when it is on its last leg.