I hate tumble driers on principle because they use a lot of juice and I actually like line dried clothes better. I have always dried clothes outside in the summer and inside on airers in the winter (keeping the house ventilated) and never had a problem.
However our current house - a newbuild and pretty well insulated, judging by the gas bills - has got pretty horridly mouldy over the winter with us drying clothes inside. We are renting and I have paid for it to be cleaned, so there is no issue with the house being damaged now. But I think if we stay here we need a tumble drier.
DP says I am being silly and drying inside is fine. Are tumble driers actually necessities? totally aware this is first world problem