We generally pay mind to both temps. I would err on the side of the hottest temp possible - sometimes, the carrier is not as reliable as they could be, and the package arrives later than its supposed to. Rather than risk the animal, we usually pack for the most extreme temps, just in case. We only guarantee animals shipped in temperatures below 90, so you may want to wait to see if temps decrease anytime soon to make it a little safer to ship.

I'd use at least one ice pack, maybe two, depending on what size box you're using. Better safe than sorry!

-Jen