It would be awesome if you guys would consider alternative types of heating systems. There's a whole bunch of Victorian-era heating systems here: https://www.buildingconservation.com/articles/heating-systems/heating-systems.htm, but obviously a Fae alternative would also be great.
There is a Stave fireplace that works as a heater with a wider range than other heat sources like cook fires.
But yeah, some other options would also be welcome.
Or move to a desert like me. For some reason it's warm there at night :D