I was kinda wondering about the sump pump myself and the humidity factor. I guess as long as there is not any water in the sump it is not a real factor in the equation.
My gun room has hot water radiant heating in the floors so I am not too worried about moisture. I also purchased the chemical dehumidifiers with the catchbasin in the bottom and set everal of them around and in the cabinets. They seem to work quite well.
To own firearms is to affirm that freedom and liberty are not gifts from the state.
Winchesters Forever (Levers and Pumps 73s, 90s, 92s, 06s, 61s and 63s)