I'd like to build a fermentation chamber using 2" rigid insulation and a small 110 v. window a/c unit I have on hand. I'm also thinking of building a dual temp controller using an STC 1000. My first question is will I have to use a relay to handle the amp draw of the a/c unit? Also I have read that I'll need to eliminate the built in temp controller on the a/c unit, I understand that part. Some people have posted that the cooling coils will freeze up with very little suggested in the way of preventing this. One poster mentioned using a computer fan?? Would like to know if anyone here has done this and how it worked out. My main reason for doing this to be able to lager.