It's so cold outside, that even turning my radiator to the maximum, is hardly doing a lot. My walls aren't the best insolated in the world and I have a pretty big exposed corner (as in, a whole 90° corner whose other side isnt just badly covered, but also rather thin...). I even had a bit of a mold issue at one point... Not a whole lot, saw it early, but it was certainly annoying as fuck x.x (let alone a temporary health issue, in my own home...)