I put a Window AC unit in my only garage window to cool it down while I work on my projects. It doesn't stay very cool and the ratting on the unit surpasses the room dimensions, its brand new and is blowing constanly. Yesterday I went up into the attic and noticed that the attic was closed off at the garage with plywood board. So I drilled two holes to look through with a flashlight. This room over the garage was not insulated at all. My two questions are: Can I just cut a hole in this wall so i can access this area from the attic and put insulation and have more storage space? And why was this sectioned off from the attic? Fire code? and if so how can I keep this fire code wall still up to code? can I install a very small door or will I just have to board it back up?