We recently took a trip through Missouri and up through Michigan, and we did a lot of wine tasting (and subsequent purchasing!) of a variety of wines--chardonnays, pinot noirs, cabernets, and one sparkling white. The wine bottles were kept in a cardboard box in the back of our car--some of them for a week--under a canvas cover. However, I'm worried that the occasional heat in the car might've ruined them. I've just opened a Seyval from our first stop, and it's lovely, but I'm worried about the others. How long can a bottle stay in higher temps before going bad? Also, how cool should the storage area be now that we've brought so many home?