I agree with Nick on this one. Making the house cooler will not help
unless you do it with an air conditioner or dehumidifier to remove some
of the moisture. You want to LOWER the dew point, not raise it.
Getting rid of the moisture source is the best way to lower the dew
point inside the house. Using better windows would also help, by
raising the indoor surface temperature of the windows above the dew
point. You could also put plastic film over the inside or outside of
the windows would also help, as Vaughn & Joseph stated. Raising the
temperature in the house would also help raise the inside surface
temperature of the windows, but that could get quite expensive.

Stretch