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XL wind turbine can generate up to 1,000 watts an hour when there is a relativelystrong wind. Many people were surprised that the entire system, which could beretrofitted for most homes in this area, cost only $20,000 fully installed and CSAcertified. Many people believe that the minimal level of investment is in the$100,000 range.Inside the house the tour reflected on the benefits of a natural air -cooling systemprovided through the skylight tower in the middle of the house. This idea,thousands of years old, is still used in the Sahara to provide a natural airconditioning system during hot weather. The cool air is naturally drawn up from thebasement and through the ho use, eventually venting out of the skylight at the topusing convection. The window in the skylight is opened during the summer in orderto drive this effect. At all times of the year the light coming in through the largecentral skylight means electric li ghts dont need to be turned on nearly as often. Theuse of opaque materials like Plexiglas and fiberglass allows light into places likebathrooms and hallways.Some of the materials used in the Wilson natural home include bamboo for woodflooring. Bamboo is a grass. After it is harvested for use in the floors the bamboogrows back. Bamboo is also a very hard wood so that it withstands the beating thatmany hardwoods might not. Other materials included parallam posts and beams forthe framework of the house , birch for the paneling and kitchen cabinetry, as well asMDF cardboard for much of the shelving. Other natural materials used includeslate, local pinewood, and gravel.Wilson Natural Home FeaturesPassive SolarR Eliminated the need for a conventional fossil fuel powered furnace system forheating;R Eliminated the need for air conditioning system with high energy requirements;R Used the structure as the main heat store removing the need to transfer energyover long distances;R Provided extensive natural lighting, minimizing the requirements for electricallighting systems and reducing overall electricity requirements;259