There are several factors you are missing. What time of day are we talking about for the hotter temps, is the door kept closed, where does the sun come up, how well is the room insulated. My bedroom is the warmest in the house year round, it gets sun all day on one wall or another, and its furthest from the ac unit. Usual temps are 5-6F higher than the thermostat. Then you add a game and gpu heat, and it gets warmer still. Liquid cooled CPU, so hush on that lol.
Best idea I have is when the pc is not in use, shut it down, leave the door open and turn the fan on.