Hi! A small wind turbine for your house is a great investment and if you do it right you will laugh at your energy bill...
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First of all you have to decide how big you want it. That would depend on how much time and resources you have to build it. I found the site below to be pretty good.
simply, wind turbine is similar to a fan. but fan is noneffective. therefore, to make it more affective, use tunnel to concentrate the force. it can be more effective if the tunnel is a bottle-shaped. the curved of the bottle-shaped allowed the difference of air pressure to take place. hence, the force of the wind is multiplied. the shape of the fan also affect the effectiveness of the wind turbine. if the shape is much more angular, lots of air can be forced in, thus making the wind turbine more efficient.
