I have a small unit that I installed about 12 years ago from the Wine Enthusiast. It is built into a sheetrock wall in a cellar I built. It still drains water but it stopped blowing cold air. The cellar is well insulated so it never gets above 70 but I would love to just have it working again. I believe it just needs freon or whatever they use these days, but I had 2 HVAC people tell me that its a contained unit and it can't be fixed. Any thoughts?