> Also things like sheets and towels really should not be left to dry indoor.
Can you elaborate on both statements? I currently leave everything, including sheets and towels, to air dry indoors.
Heat pump or condensing dryers may well be a better option.
Almost certainly the perfect solution will be situational. I mean, if your house is too dry in the winter, a bit of extra humidity might even be a feature, after all...
Winter air tends to be much drier than summer air, so much so that my bath towels dry on the rack in the winter overnight, but may stay damp for a whole day in the summer.
That said, water will condense at heat bridges (?)(poorly/not insulated parts of the wall) in the winter, causing mold, if the place is poorly insulated.
Where I lived before, that's still 80% (usually 90-95% in summer)