A comment on the winter dryness problem: it's well known that a decent humidity level in the winter is very much more healthful for people, pets and furniture than a dry house. We keep ours at as close to 40% as possible, which for the last several winters has not been hard, even here in Wisconsin. The condensation on windows, outside walls etc results from contact between a cold place on the wall, due to poor or inadequate insulation, and that nice warm humid air. The colder it is outside the more moisture will collect. Windows can be helped by really good (not aluminum framed) stormwindows, and a sheet of clear plastic on the inside. This is often done here in Wis. In the Scandinavian countries we've seen triple-glazing, literally three windows, which works well. There are still drawbacks, like the doors, where there is an inevitable air leak, jamming and not closing well. We have a house full of good furniture, harpsichords, and antique pianos. We do not get colds, and the cat does not get itchy and miserable. There are costs. You have to decide I guess. They haven't designed Dampp-chasers for people to wear around their necks yet. Margaret Hood
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