I see daestrom's point from a Physics point of view, but in
practicality I agree with Nick. With months of heating season ahead,
you have damp air in your house. What can happen to that air? It can
be ventilated, exhausted from the house (and, in most climates,
replaced by drier air) and the vapour energy is simply lost (to the
homeowner). The only way to keep the energy is to condense the vapour
inside the house, and the best place for the condensed vapour is down
the drain (or in houseplants), thanks to a dehumidifier. Not in your
books or insulation or constantly on your windowpanes.

--
Jonathan Berry