I'm a little bit surprised, but we don't really have humidity problems here. Even during los tiempos difíciles, when I spent 20 or so hours in my room with no windows open and the door closed for 99% of the day. I wonder if it all escapes through the same way as the heat.

My bathroom suffers from mould issues sometimes, but it's just about entirely my fault. The fan and light are on the same circuit, and there's also a skylight. So if there's enough light from the skylight, I often don't turn it on. It also sucks out all the heat and warmth, and ain't no-one want to get out of a shower into a 12° room