eddie_van_quailen
Songster
What brand of incubator are you using?
If it's the standard foam type (Harris Farms Innovator, Hovabator, Little Giant, etc, with 2 small red vent plugs, I leave both of them off. I usually only have to add a tiny bit of water, once a day to keep the Rh up to where I want it. Mine are in a AC controlled room and kept at 80°F.
Mine is a Hovabator Genesis 1588, styrofoam with a fan and 1 vent plug (currently open and will stay that way!). I am planning to put a radiator in that room to warm it up before the chicks hatch this weekend. But the room hasn't been heated during incubation.
I have been adding just 10-15mL of water each day, and that seems to be keeping the humidity right around 34-36%!