Well, check out this link and make up your own mind. I used to drop temps for the winter but haven't done it for years though I'm sure it does naturally drop by a few degrees in the winter. I haven't seen any increase of slugs. I do think that many people are keeping their snakes too warm year round. I personally don't think you should have a hot spot higher then 90 and frankly even that might be a bit too high. Well, here is the link. - http://en.wikipedia.org/wiki/Climate_of_Ghana