Photograph by Dan Chavkin

THE BEST OF GREEN DESIGN: LivingHomes prefabricates houses with nontoxic materials, making for healthy shelters — both outside and in.

1. WALLS Western red cedar paneling by Eco-Lumber Co-op comes from forests that have been certified as responsibly managed.

2. LIGHTING Recessed LED lights by Permlight draw 33 percent less electricity than already thrifty compact fluorescents.

3. REFRIGERATOR Bosch’s Evolution 800 refrigerator is 16 percent more energy-efficient than federal energy-use standards require.

4. HEATING Radiant heating tubes—fed by an Apricus solar water heating collector on the roof—snake through concrete floors, warming the home’s interior.

5. FLOOR Cork planking from Natural Cork is milled from naturally regenerating tree bark and contains no formaldehyde.

For more information on these tips, visit: www.popularmechanics.com and www.livinghomes.net