Winter living vs Summer living
I would like to add some more ideas. In all parts of the world where winter gets really cold, people adapt their way of living to the seasons. If you're interested in this topic read about the northern Canada and Russia natives. They would live in different housing during winter than summer. They would dress differently too.
I apply these principles too as I have a home office and don't want to spend all the money I earn buying fuel. During winter, the kitchen table becomes my office. We eat on our knees or on the counter. We also have in that same room a sofa bed we can use if its too cold in the bedroom or one of us is sick and needs to sleep in a warm room. This room also contains the wood stove and one of the 2 electric radiators of the house (the other one is in the 2nd floor passageway and can only manage to prevent freezing of the 2nd floor rooms). Most old houses around mine have an insulated door to close your 2nd floor during winter. People would basically live "downstairs" where the wood stove was during winter.
During winter, all other rooms are not heated other than by sunlight. When I decide I want to bath, I must think in advance to open the bathroom door so it gets kind of warm. Otherwise it's about 15F in the bathroom and any unused room. This is useful, because I can then keep all my garden produce for a very long time in these rooms! I still have some pumpkins, potatoes, Jerusalem artichokes and onions (march 18) in perfect condition.
We wear wool socks all winter long, even in our shoes indoor. We wear a couple of layers of clothes, because a few layers are better at keeping you warm than one thick one. If I get cold while working (mostly in front of a computer unfortunately), either I go take a short walk (exercise warms you up), or I wrap myself in a blanket or wear a woolen cap.