P.S. ????? you bought a digital temp gauge thing that also tells you humidity right I hope? Don't trust that free temp thing they give with it. It is junk and doesn't work well it is always off.
When u add the water yes it will drop temp so then you need to turn your heat up until it is at least 100.0 then after it is staying and it bumps up you humidity you can then turn the heat down till you get to like 99.5-99.9. It just drops every time anyone adds water. I keep a gallon of room...