Rob,
A low indoor winter humidity is a symptom of excess air infiltration. Outside air, at 32 F has a certain amount of moisture, but this humidity decreases rapidly as the air temp is increased.
Great time to do a FLIR or other IR test by turning on all house exhaust fans.
Just read AC's comment - we agree.
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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