I lived for almost three months with 12 degrees during the night (10 probably where the stairs were located, since that space was not heated at all) and 13-15 during the morning, before heading to work, since even after my several complaints about feeling really cold she would not set in advance a decent temperature with the heating system, and instead, would start treating me differently. If nobody was at home during the day I would come home after work finding 12 degrees in the home, during winter. When my parents came to visit me and lived in the same house the heating system completely broke and we lived for three days with electric radiators, freezing when coming home after a day out. She apologized to my parents and treated me like the girl who ruined her time on vacation because I complained on behalf of my parents and during that time she didn't even answer my texts (she was away). I/we felt a burden for her. She then changed the heating system, few days before I left, and told me that she had to pay a large amount of money to have it repaired, and said that in a way to make ME feel guilty. I think she kept those temperatures on purpose in order to save money (plus the heating system did have some problems and eventually got broke because I dont think she really did care about me) but I travelled a lot and studied/worked abroad a few times and I never had to live with those temperatures. In Italy (and Germany, Boston, as far as I know) we keep 18 during the night and 19-20 during the day. I had to pay 800 euros per month to live far from the city(and pay the expensive transportation) to live in the cold and with a not so nice host, when it came to talking about the heating. Apart from that, I have to say that the house was really clean.