The eco-friendly cabin includes a 3,000 KwH solar array with a back-up generator, a hybrid insulation system, and radiant floor heating that keeps the home airtight and warm during the cold months.  Photo 10 of 14 in 7 Efficient Prefabs That Prove the Power of Modular Design

7 Efficient Prefabs That Prove the Power of Modular Design

10 of 14

The eco-friendly cabin includes a 3,000 KwH solar array with a back-up generator, a hybrid insulation system, and radiant floor heating that keeps the home airtight and warm during the cold months.