An Earth Advantage Energy Star vacation home near Ashland, Oregon.

Built from the ground up, this example of green construction, incorporates geothermal heat, passive solar energy, superior insulation and many other green features. Plantation-grown Satinwood. Recycled steel shutters. Hardiplank siding. But the true theme of this house is energy efficiency. The dyed concrete floor resembles slate tile but with a smooth surface, making it a snap to clean. The floor becomes a thermal mass that keeps the home warm (and cool) long after the system has been turned off. Earth Advantage declared the Hyatt Lake house was one of the most energy-efficient homes they had ever tested. Even in the dead of winter the utility bills are less than $100 per month.

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