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Welcome to BYC!
When incubating eggs, the heat is supposed to be 99.5 F or 37.5 C if you are using a circulated air bator. If you are using a still air incubator, then you want the temp to be 100-101 F (or 37.7 - 38.3 C) at the top of the eggs. In my experience, a healthy range for a circulated air incubator is around 99.3 - 99.8 F, the closer to 99.5 the better. Chicks might die or not develop if you get too close to 99 or 100 for a long period of time.
If you go too low or too high, your chicks can have defects and/or die. As for humidity, I highly recommend the dry incubation method. If you live in a very dry area, you might need to add a little water but do not go over 40%. You want to keep it around 30%-35%, but going into the upper 20s or close to 40% doesn't hurt them.
I don't add any water until day 18, when I up the humidity to around 55% and stop turning. You can go up to 75% but no more on lockdown. Too much humidity and the chicks drown, to little and they get shrink wrapped.
Hope this helps!