I wouldn't necessarily worry about heat, with it being a warm time of year... Even if you have to travel with the windows cracked, better u be a little warm than ur snakes getting cold...but again being the time of year it is I wouldn't stress to much about it.... The way I transport my animals is, put each snake in a pillow case tie a knot at the top, put 3 snakes (depending on size of snake) or more per 28 qt tub with lid... Less tubs or totes u have to lug around....