Since it got properly cold out we’ve started to notice a mould problem in our flat. Under one of the windows in our kitchen / living room, and a corner in the bedroom have had patches of black mould (it wipes off but that’s obviously not a permanent fix), and every morning the windows are covered in condensation. We’ve bought a couple of passive dehumidifiers which are filling up but don’t seem to make a dent.
I’m not sure what the best things to do are - our boiler is old and we can only really turn it on and off, no timer, so it’s on in the evenings and everything is fine and warm, then we turn it off before bed and wake up and the flat is generally quite cold and full of condensation. I try and keep windows open where I can, but, you know, it’s cold out there. Anyone else suffering? Have any bright ideas?