Keeping warm by living inside a greenhouse

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Just watched a very interesting and inspiring video about a couple in Sweden who have built a greenhouse round their original summer house in the country round Stockholm. The costs of heating in the long cold winters has dropped considerably as even one hour of sunshine heats up the house significantly. There is water recycling , including toilet wastes,which are separated and then purified in stages before going out to the garden. Water is stored once clean and is used for flushing the loos and watering plants. They have planted a fig tree in the greenhouse, which would have been killed off by the sub zero temperatures. The growing season has been extended by about two months and grapes, tomatoes, courgettes , kiwi fruit and peaches can be grown. The roof of the original house has been removed and a roof terrace constructed and there are bedroom balcony areas and decking. The timber on the house needs only to be treated with linseed oil as it is not exposed to the elements. While this house would only work in colder parts of the world it seems like a really good idea to me. What do you think? Photo by Fair Companies