What do chairs do?
if a survivor goes and sits in a chair without you making him do it, don't bother him, he'll be reading a book (the more you have, the better) and it will help reduce sadness. an armchair would obviously be more comfortable, therefore helping more. unfortunately, there isn't any "guide" that tells us exactly what to do and how things will work out according to different actions, you just have to try things and see it for yourself. nonetheless, I hope I was of any help! :)