The Iowa Nest is a 3-bedroom, 2-bathroom, 2400-sq. ft. house in rural southeast Iowa. Key design features include an earth-bearmed design (which plays a key role in the home’s energy efficiency), an open-plan living / dining room / kitchen with expansive views of a lake, an underground garage, and a 600-sq. ft. storage area.
- Average energy bill: $2 per month
- Passive performance: the home can maintain 60 degF inside with -30 degF exterior temperatures … with NO active heating!