Cooling unit recommendations

[strausj]

I am currently constructing a wine cellar in an old coal room in my basement here in Chicago. The room is 7x20x7, has 3 walls of stone (2 feet thick & 3/4 below ground), one wall is wood frame. The temp is ranging from 55 degrees in the winter to 72 degrees in the summer (outside temp 96 degrees). I would appreciate it if you could recommend a cooling system for this cellar. I currently have approx 300 bottles and plan to expand.<P>