construct or live in an eco-friendly house

We have built two houses. The first one was mostly energy efficient. I did not want an air condition system, but my husband insisted. I also refused a dishwasher.
The second house is really energy efficient, in floor heating, passive solar, wood burning stove and no air conditioning. The enery bills are really low and the house is very comfortable. Now we are looking at a third and final building project. I want this one to be truly green.