About keeping the eggs cool during the day; when I was hatching fence lizard eggs in my homemade styrofoam incubator a triple digit heat wave hit and lasted for about two weeks, so I would put an icepack in the incubator to keep the temperature in the right range during the heat of the day. Of course I had a thermometer and thermostat, and the thermostat could work in tandem with the ice pack. I have an incubator because normally my temps don't get anywhere near as hot as that, especially at night, when the temps drop considerably. But if you just put the eggs in a Styrofoam box or big cooler with an ice pack and a thermometer that may help.

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