FROM THIS CARESHEET: http://www.nyworms.com/ccare.htm
Temperature
Crickets thrive at temperatures higher than those in the average house. They prefer 80-90 degrees F. (26-32 degrees C.), however they seem to live longer at somewhat lower temperatures - something to keep in mind if you want to keep an excess of crickets alive as long as possible.
Smaller crickets require warmer temperatures. Pinheads do best at 88-92 degrees F., with 1/2 to 3/4 inch doing best at 80-92 degrees F. and adults at 75-85 degrees F.
Cricket nymphs (smaller than pinheads) held at 80 degrees F. require up to 60-65 days to mature, while those kept at 90 degrees F. require only 30-35 days to complete their development.
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