Part 2: Earthship Homes 101 (part 2) . Imagine building a home that produces all its own energy, most of the food you consume, requires no furnace even in a cold northern climate and still have a comfortable shirtsleeve temperature inside. That’s the promise of the Earthship design that uses passive solar heating and makes use of natural and recycled materials, thermal mass construction for temperature stabilization and renewable energy & integrated water systems to make the Earthship an off-grid home with little to no utility bills.