Many thanks for posting the link to the Morgan/Chateau vid Javier, it brought back happy memories of Morganeering in France some time back when we had the good fortune to stay in a few Chateaus, though none quite as modernised as the one in the vid.
Our time in France was in the month of June, I can well remember that regardless of the opportunity to enjoy a little bit of aristocratic lifestyle, Chateaus were cool if not downright cold, and the owners seemed to be almost confined to a much smaller room in order to be comfortable on all but the warmer days. I can only guess at the possible heating bill to even begin to bring any one of those high ceiling rooms with their tall single glazed windows up to a reasonably comfortable temperature on a cool summer day, let alone in Winter.. But I guess in Winter one might just jet off to ones other abode in a warmer part of the world.
https://www.tm-img.com/image/tbW7Uhttps://www.tm-img.com/image/tb0jc
