Absolutely 100%. Having a thermostat is critical - having a fogger is not.
What about the option of a humidifier for the entire room your snakes are in? 50% is easily attainable with a humidifier and still comfortable for living (IMO). Then you could still mist during a shed cycle to get the extra humidity that's needed during this time. They're pretty cheap at WalMart, Target, Walgreens, etc...
Here's a thread on the topic of foggers for BPs: http://ball-pythons.net/forums/showt...ghlight=fogger
Here's a pretty decent video for a DIY fogger if you do choose to go that route: http://www.youtube.com/watch?v=Vr8-S3JkafQ
Hope this helps!