Going to be building a cool room for the first time and just want to be sure to insulate it properly. It will be in the Southeast corner of our barn. The walls have 6x6 posts and metal siding on the outside. The roof is 8' on one side and 13' on the other and the area is 24x24. Using a self-contained whole house ac unit my uncle used for his house for years. Just have no idea as to how to insulate it, any help would be greatly appreciated.