I had a similar issue in my old apartment. You might consider the use of a thermal battery. Cool the space at night (when it's cooler already) as much as possi

I had a similar issue in my old apartment. You might consider the use of a thermal battery. Cool the space at night (when it's cooler already) as much as possible. Then during the heat of the day, use thermal curtains to both block the heat out and to trap the cool in. On days where that is simply not enough, cross breeze is underrated. Get one of those magnetic mosquito door net things and set it up on your front door. Open the windows and the doors when it's too hot for the AC to help and get some air movement with a fan if necessary to push air from the shady side to the hot side.