It was. We blocked off all the windows in our apartment (outside and inside) with old bed sheets and towels. We camped out in our living room with our A/C unit, keeping the "cool" air localized by blocking off the rest of the apartment with bed sheets and towels.

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).