I have read people put the still air bators in closets to keep temps from fluctuating. And putting extra sponge in should raise the humidity more. I would try until you know for sure what works. I would hate to see you loose eggsEven with the water in it the humidity is at 35% =/ Hopefully I can get it to go up at day 18! But if the temps stabilize to around 100 to 101 I will put them in. I moved the bator to my livingroom because I realized where I had it (on top of my drier) the temps will go up whenever I do laundry. So now it's on my end table.