Stinkyattic ~ The lights, inside fan and exhaust fan are all on 24/0.

Trancefusion5 ~ The fan is always on.

veggie ~ Yup, the A/C is running at night. Our outdoor lows at night only dip into the 80's.

I kinda figured it's a ventilation issue since at night we aren't peeking in on the babies every so often and no one is moving about the house. Last night I tried leaving the zippers at the bottom front of the box open to let in more intake air. I checked it this morning and the temps during the night ranged from 79 to 84. I get that same range during the day with the zippers closed.