I have a 30x30 metal building. I have no windows. What would be the
best and cheapest way to air condition it? I thought about a window
unit but I have no windows and not sure if cutting the corregated
metal would work right.



*These are nice package units and are available with heat or without. You
would need to cut a hole for the ventilation grill to penetrate to the
outside.

http://friedrich.com/products/vert-I-pak/overview/