After playing RDR 2 for a few hours last night at 1440p maintaining above 60FPS all times with it still being above 30c outside I honestly think my office was pushing 40c - insanely hot but good atmosphere for a cowboy game.
My windows are hot to the touch again right now with 34c outside, has to about 36c in my office now, but last night about 2am it dropped to 21c at the lowest, that's the time to open the windows wide for a few hours. After playing RDR 2 my office felt about double the temp of my bedroom that had the windows wide open.
Just as well I'm self employed and make my own time, first time I could actually could sleep last night in about 3 days but not till about 5am.