you dont need to make things over complicated....if you have humidity problems then consider taking aluminum foil and taping in down on the outside top of the screen mesh...you dont need to blow $ on a auto mister...totally unnecessary...humidity should be 40-60% and during shed 70% ish...keep in mind there exists no where on earth were humidity is always 100% constant and stable at 50% or w/e.

I would suggest a UTH controlled by a thermostat and a single overhead heat source controlled by a dimmer...I would not personally use a ceramic heat emitter b/c fire dangers make my paranoid and those things heat up to extreme temps and i have had 2 housemates crack both of theirs....but thats my personal opinion.