You can use dehumidifiers at a fraction of the power cost of full air heating, given that you only need to keep the surface pores of the e.g. wallpaper below a humidity that supports mold growth.
Similarly, the bathroom could gain a second insulated door-ish curtain for an airlock effect fairly easily.
replyHeat recovery ventilators are one possible solution. You can hook them up to home assistant humidity sensors and open a vent for example.
replyI got a CO2 monitor, and noticed that it often went over 1000 ppm CO2. So I started cracking the windows slightly, which resolved it. There are downsides to sealing the house too tight.
replyAn electric dehumidifier in winter keeps moisture in check and you get the energy of evaporation back as heat.
replyWe solved our humid air in the bathroom with an active extraction fan that starts when it registers humidity and light (I think) in the room.
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