Do heat pumps work in cold climates?
It&#x27;s interesting that every time this comes up, return air heat pumps are never discussed. It&#x27;s always the AC-kind. Is there something about how ventilation is built in e.g. the US that prevents using return air for heating? Where is the air that&#x27;s drawn from kitchens&#x2F;bathrooms typically going in a reasonably modern US home?