i mean, open the egg tub for removing the air can cause spike on temperature cause i have to open the incubator and the egg tub once a week. Inside all the incubator i had 32ºC and outside the incubator i had 15ºC! are you understant what im trying to say? that because i use no air holes, but some breeders just use one hole on each side and they do not open the egg tub for the entire incubation period.beside that, i have a thermometer wich give me the temperature maximum and minimum (flutuation) and i had no more than 1ºC once in a while for the entire 2 months. I use an reliable and expensive microclimate thermostat.