VKR Holding, based in Hørsholm, Denmark, is financing in five European countries to build a sustainable, affordable house that uses readily available technology to negate its imprint on the environment and to promote the health and comfort of its inhabitants. The Simonsens had lived in the house for 3 months, and it was already abundantly clear that this was going to be an unusual year. The windows' frames also add insulation. They are made of a brand-new type of polyurethane strengthened with thin glass threads. Engineers at Velfac, a VKR subsidiary, tested more than 200 materials before finding one that was at once highly insulating and durable and had a pleasing surface finish. Sensors in every room track the temperature, carbon dioxide levels, and humidity, and a weather station on the roof monitors outside conditions. The Simonsens will be moving out of the house in one month, and the Home for Life will go on the market.