Beth:
I also wear contacts. I wear monthlies. When you say "change out", do you mean changing the actual lens or merely removing them and placing them in some sort of wetting solution for a while?
As it happens, I will soon be having dinner w/ my eye doctor (he and his wife are family friends), I shall put this question to him. He lives in Arizona where, as you know, it is a dry heat. I'll pass along any advice I receive.
Doug