I live in a two story apartment and I'm in the top floor. The apartment is pretty old, 54 years old. Due to that, the insulation is really lack luster. The windows are single paned walls are relatively thin.
Even if I keep my windows covered and windows closed, after a hot day, the room becomes a sauna when I get home at night. It's cool at night so I just have to vent the heat out. However, during the day, r it is almost impossible to get the AC to make much of a difference. I have to stand in front of the AC to feel cool. The AC feels plenty cold and strong and my apartment isn't very large(<600sqft).
What is causing this? Is the cool air simply escaping? Is it all the heat coming through the windows? I have pretty thick light blocking blinds.
What can a renter do to make the apartment a little nicer in the summer?