Another benefit of an earthship is that it saves energy and natural resources. For example, an earthship uses less water. Rain water, which is collected on the roof, is used for drinking and bathing. Furthermore, earthships need much less energy for heating and cooling because they are built into the ground,whichkeeps the temperature inside the house from getting too hot or too cold. In the long run, this helps earthship owners liwer their utility bills. As well, one well of an earthship usually faces south. Therefor, solar heat helps to warm the house, and solar panels built on the roof generate electricity to run applIances in the house.