I have borrowed an RCOM 20 - its just the standard model, and does not have any pre-set settings on it. Lady I borrowed it from has only ever done duck eggs so had no idea on settings for chickens.... I did a bit of research and found a video clip by the supplier that said to set it at 37.5c and 45% humidity. I am at day 17, eggs look ok, my first hatch was in a Brinsea Mini Eco and I had to tinker with it a bit to get enough moisture loss for the air cells, but in the end got there with a perfect 100% hatch . Now I am concerned that perhaps cause we live in a high humidity area I may need to change the settings on the RCOM too?? Does anyone have any experience with the RCOM 20? Its very good at holding the humidity at set level, does this mean that the outside humidity won't effect the incubator?