Man that's tough, Wade. Sorry to hear it! What I do is keep a few blocks of ice made from RO in the back of the freezer just for these situations. Since we don't have chillers, we need to get creative with fans and ice hehe...
These late season heat waves can sure suck though, I guess we all can't just get comfortable yet. Luckily my stuff is used to getting spiked up to 88 degrees every so often. 90+ though would definitely kill some corals. I lost my frogspawn to a summer heat wave 2 years ago, pretty much same deal as yours. Weekend camping trip, come home to a 88-90 degree tank and 5 colonies dead. Yuck.