We live in a drafty Victorian terrace. Never really had a major issue with condensation on the windows or mould / mildew growing on the window frames, but this year it seems to have gone crazy on our two remaining single glazed, wooden framed windows (replacing all the house windows is a work in progress) and today I found a couple of mould spots on the wall on the landing, which we have never had before.
We are lucky and we can still run the heating for two hours twice a day, which is what we've always done. No changes there, although I know lots of other people are experiencing more mould because they can't put the heating on as much or at all.
All bathrooms are fitted with working extractor fans.
Windows are opened all the time in the summer, less so in winter but I'm trying to crack them for a little time each day. We have trickle vents on most windows which are open.
Laundry is often dried inside in winter, but again we've always done that.
I don't know what we're doing different that's causing this! I'm getting fed up of having to wipe down the windows each week and spend £10 a bottle on mould/mildew remover for the showers.