It’s my understanding that heating becomes less efficient when you exceed humidity levels of ~60%. In those conditions you are also likely to encounter black mould due to the moisture condensing on the coldest surfaces which would likely be the walls or ceiling since the windows have been shrink wrapped.
wfx_4 t1_j1cghng wrote
Reply to comment by perpetualwalnut in Old house, walls are cold by AliveConversation387
It’s my understanding that heating becomes less efficient when you exceed humidity levels of ~60%. In those conditions you are also likely to encounter black mould due to the moisture condensing on the coldest surfaces which would likely be the walls or ceiling since the windows have been shrink wrapped.