What do you think of sustainable houses?
The technology used for building is improving every day, but if it's a super energy-efficient dwelling you're after, the tools are already well at hand. Once a year, the Northeast Sustainable Energy Association organizes a green buildings open house where energy nerds like us can see the latest in home efficiency. 

Source: CNET

On the other hand, if you want to built a different house, to be in harmony with nature. You might want to consider these inexpensive ideas... 

The green house in Florida. 

Installing a geothermal heating unit.
Do you konw someone living in a sustainable home? 
What you think of sustainable houses? 
Read more @: http://news.cnet.com/8301-11128_3-20117478-54/on-the-road-to-a-low-energy-house/#ixzz1aIeJYTrh