I've just finished a DIY incubator from instructions I got here: http://www.instructables.com/id/How-to-make-a-styrofoam-quotstill-airquot-egg-/. My problem is, while the temperature is remaining stable at 99-100 degrees, with occasional jumps up to 101, the humidity is ranging from 55% to even 70%! I tried putting eggs in after it had stabilized at around 54% humidity, and it immediately jumped up. The incubator is less than a cubic foot, about 9inx9inx9in. I had a dish of water at first, but the humidity stayed too high. My question is: Does the humidity have to stay below 70% during the first 18 days of incubation, or does it matter? I imagine in regions where the relative humidity is much higher, such as in the southern US, it would be hard to keep it lower, but somehow broody hens still manage outdoors! If I have to add more ventilation holes, that's fine. I'm just worried I'll have to fiddle with the thermostat all over again to compensate for any loss of heat. Any help is appreciated!