Good morning! Im new to the forum as well as raising and incubation. I have built an incubator from and old fridge. Seems to work well. My only issue is that the temps seem to range. I have 2to bulbs wired to a termistate and ut cuts on and off like it should but it will go up top 100in then cut off and then not come back on til like 92. Is this bad? Im using a lower thermistate from an old waterheater. Thank u for any help!!