I recently moved into the attic and converted it into my bedroom, There was insulation on the floor but none on the walls which made it uncomfortable to live in considering its the summer. I got a 8000 BTU portable AC and it does a good enough job but I when the weather is 90+ it doesn't do that good of a job. would getting insulation on the walls of the attic make a difference or am I better off looking at alternatives, thanks.
PS. I live in Pennsylvania