I wonder how they control humidity inside the home and prevent mildew/mould? The air in the greenhouse would be very humid all year round I would have thought?
I am a little confused about this fear people have of mold and mildew in their houses. Up until very recently people's houses weren't far off from the outside environment. Generally in the summer the best they did was keep the rain out and provide some shade. Houses weren't uninhabitable mold pits back then, why would they be now?
It's sometimes hard to imagine how hard and unprecitable lives of past generations were. For most of history people's indoor firepits didn't have chimneys, for example, and the health effects were less of a concern than wars, infectious diseases, getting hurt in physical labour, or famine.
Also, most old houses were well ventilated and built of mildew resistant materials (= poor insulation and wood).