does your bator have a fan? with fan 99.5 is the temp needed. without a fan 101.5 is the temp needed. mine has no fan. temp 101.5 and put water in the two bottom trays, add a little water every 6 or 7 days, oh and these bators take several hrs to stabilize the temp. one complete turn on the thermostat is 1 degree in temp. around day 14 on, you will notice the temp rising, you will end up turning it down a full turn a little at a time until hatch thats the chicks growing and giving off heat of there own. i hope i havent confused you in any way. i have both cabinet and styrafoam bators and both work great with a little practice and most of all good quality eggs. 50% hatch on shipped eggs is the norm any more than that is super. good luck