It's not as easy as all that.
We've been in this house over 10 years. Had no mould problem. We keep the place well heated and adequately ventolated.
Then Covid came and all 3 dc were home plus dh started working from home. We didn't change heating nor ventilation, but that winter I was battling mould continuously.
There were two major changes that year:
- The working from home meant that rather than the house being empty all day 5 days a week, we had 4 people home all the time
- We got a better shower so the children were using that rather than baths.
So we introduced a rule to say that after any shower the bathroom window must be left open (they normally did this automatically, but sometimes not when it was cold) and that has made some difference, but not total difference. And that all rooms must have the vents open on the windows.
Another interesting thing on the mould was dd2 told me this morning that her room was dreadfully mouldy. It wasn't, but it was beginning to grow on the corners again. It hasn't had a problem since we introduced the new rules.
She had been working outside the home until December, and since then has been working from home in her room.
So my conclusion is that although ventilation and heating help, there are other factors, like working from home, number of showers etc that can mean a house gets more mouldy for some lifestyles than others.
Yes, it is still our responsibility to look at the situation and change accordingly, but if your situation changed, as ours did, it can take some time before you realise that you also need to change other things.
If you already are in a stressed situation, then it's very easy to not be able to deal with an extra stress-plus some of the mould removal sprays are pretty toxic-I know if I don't have the room very well ventilated while I'm spraying then I struggle to breathe in a way I don't with anything else. So I can totally see how a young mother, on her own, may feel unable to cope with dealing with it.