What to do about persistent problem humidity?

If the simple steps above don't solve your problem, ask your heating contractor about installing an outside air vent for your furnace...or the addition of more or larger exhaust fans. Remember, windows do not cause condensation but excessive humidity levels can. The reason for excessive window condensation and humidity can be complicated. Sometimes the diagnosis requires the service of a qualified expert who can make recommendations based on an overall evaluation that includes: the number and type of windows; the type of double-glazing system used; the heating system (hot air or hot water, perimeter or interior wall heating); the type of insulation and vapor barrier, and the type of soil and quality of drainage. One thing is clear. Whatever is required, homeowners cannot afford to let humidity go unchecked.  more