This PDF document was a research study that shows that humidity and moisture in houses will produce on average 220 pounds of water over a typical winter. With the built-in humidistat pre-set at 60% relative humidity, your Remington Solar attic fan will kick on and kick out the unwanted humidity in your attic.

It’s kind of a “technical” read, but here’s a link to the document. From Lawrence Berkeley Laboratories:

HumidityInAttics- Research Paper