Even with the A/C unit (rated for about 465 sq ft) full tilt 24/7, our living room never dipped below 85 F. The rest of our apartment was well over 95.
Our poor cat was absolutely lethargic. We wiped her down with a wet washcloth every few hours, which she clearly appreciated. I think the A/C unit was a bit loud for her, though, because the dumb thing kept trying to sneak back to her favorite spots which were outside of the living room (and therefore over 100 F).
Edit-Also, you should have covered every bit of the inside of the window with aluminum foil. Flat up against the pane of the glass. Then have towels/blinds on the other side.
(Those sound like good suggestions, in all seriousness.)
doesnt that mean your windows are leaking like sieves? to the point a ~10000 BTU unit couldnt keep up with one room? :o or was it one of those portable exhaust only ACs sucking cold air out of the apartment creating a negative pressure?