Thought I would pass along this story I was told.

This guy said he went and purchased a mini refrigerator. The ones that are about 3ft tall. He took the door off and cut a slot out of it big enough to slide his tower into. He then mounted a sliding rack on the inside bottom of the frige. He fitted the door on his tower so that the face stuck out about 3 inches and sealed it with silicone.
Next , he mounted the other half of sliding rack on the bottom of the tower. Lastly, cut a hole in the top, slid a piece of pvc in it sealed that and pull the cables and power cords through the pvc, wired tied them tight and filled remaing gaps with silicone. Now he just slides his computer in and out of the frige with no heat worries.

Maybe some day I will give that a try.