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jay
 
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Do you have windows in the basement? Opening the windows will allow air
to circulate and remove some of the dampness and humidity.

Yes, there are windows, but opening them is not very convenient, and leaving
them open could worsen the problem if it is a humid day.

By the way, simply by keeping the blower motor of the heating/ac system
running continuously, the circulation of the air throughout the house, so
far, seems to be keeping the basement's relative humidity within the mid to
upper 50s (as opposed to sometimes creeping up into the mid 60s if the
blower motor is turned off). The humidity in the rest of the house is still
well below 50%.

Is a basement relative humidity level in the upper 50s too high if the goal
is to prevent potential mold/mildew in my finished basement?

Thanks,

J.