I have a 5CF chest fridge that lost gas after three years. I found it too small so I just bought another 7CF unit. I read this theory that refrigeration units that are left idle for a long time will loose gas. There may be something to it. If lubricating oil isn't cycled thru on a regular basis, refrigerant may leak thru pinhole leaks faster. I have the vacuum pump, refrigerant, meters, tap and hoses. I just can't seem to get them all together at the same time. I'd like to have a cooler just to keep fruit and other things at about 45F. Someday.