They can take some getting used to and struggle with mould if not operated correctly but show the levels of insulation we should be aiming for, shocking the we still build new houses that we know will need to retrofitted to achieve net zero, guess it's good for profits though
Has anyone been in a 'Passive House'? They are so efficient that they don't have conventional heating. Body heat and sunshine are enough https://passipedia.org/basics/what_is_a_passive_house