The four-season greenhouse is one solution that can be used to work towards regenerative living. To work with nature, this greenhouse is designed to maximize the capture of solar energy through the coldest parts of the year, to retain that heat with insulated walls, and to store excess energy for later use in an Earth-Air Heat Exchanger. Together, these allow the growing season to be extended such that crops can be grown year-round, a necessity with the cold winters we have in this corner of the world.