Guys I am living in a 500 sq ft apartment built in the 1950's and it has a south facing wall. I run the 10000 BTU AC almost 24/7 and in the afternoons the wall is very warm if not hot to the touch on the inside. and appears from the windows to be around 9 inches thick with stucco on the outside.
Because of the age and the make of the wall, I believe there is either no or little insulation. Would it be worth the cost to place rigid R type insulation over this sheet rock (drywall) on the inside and drop the temperatures?