What if the open fire is the main system of heating your house, that has (both by accident and a stream of unfortunate decisions) long ago been built in the mid

What if the open fire is the main system of heating your house, that has (both by accident and a stream of unfortunate decisions) long ago been built in the middle of a perpetual blizzard ? (And where most of the occupants demand a 22°C room temperature ?) (Feel free to suggest a humane way to deal with those occupants, if you're convinced that you're furry enough not to need the open fire. On the other hand, we're having this discussion on computers connected to the Internet, which, for the sake of analogy, we might as well call "the barbecue on top of the open fire in the living room.")