My incubators are set at 99.6F for incubation, if those are your only two options I would choose 100.8
The lower temp the eggs may take a few hours longer to hatch and the higher the temp the earlier they might hatch.
Are these chicken eggs? low temps will kill some embryos (like turkeys).. so you don't want to go too low.. without knowing what kind of incubator and what kind of eggs I would tend to go with the 100.8.. it's still in the acceptable range however it leave pretty much no room for temp spikes if those were my only two choices I would go for 100.8 for incubation then drop it down to 99.0 for hatch
Its got a fan and its for chickens. I think ill keep it where it is. The temps fluxuate between 99.7 and 100.8. Humidity is steady at 33%. I think it looks good and im ready to start incubating.
