I never have cooled, I always leave the UTH's on. The room temp during the Winter gets cooler at night so maybe that might be some form of cooling.

Last season I was successful and this season I have females and males locking up great every time I pair them right now .

I sometimes mist them just once, but I don't do that too often. Usually pairing them right after a meal gets me the best breeding results, but that's how my snakes are.