I'm trying to get my homemade bator stable so I can set some eggs. The temp. is swinging from 105 to 97, the humidity from 55 to 35 (with the temps). I have two pill bottles for ventilation. When I open the one, it goes to 97. If it is closed, 104 or 105. What I'm wondering is if I could plug it with a cotton ball? Would that allow enough air exchange yet keep heat in? Thanks!