I had a feeling. The dehumidifier manufacturers (and their paid partner bloggers etc) insisting it takes weeks and weeks to start taking effect always struck me

I had a feeling. The dehumidifier manufacturers (and their paid partner bloggers etc) insisting it takes weeks and weeks to start taking effect always struck me as odd - probably because even at full whack you're probably drying out the furniture etc at a very very very slow rate, because you're mostly in a losing battle drying out the fresh air. I wouldn't be surprised if energy companies were behind their popularity.