Hello all. I have one of those square styrofoam hovabators....1602 I believe is the model nbr. Didn't have time to get heating element replaced because my eggs needed to be set asap. I used two (2) nightlights and the temp was between 99 and 101. Made an adjustment with ventilation and got it steady at 99 degrees. Left for the weekend and came back to blown bulb and 90 degrees temp. Replaced bulb and its back at 99. Hope this will be helpful to someone
