While true, climatization during the summer months is the bigger challenge and probably even more expensive when trying to achieve a closed system to keep out t

While true, climatization during the summer months is the bigger challenge and probably even more expensive when trying to achieve a closed system to keep out the pests. A greenhouse in temperate climate (eg. Sweden) captures approx. 2.9 fold the energy amount that is required for heating in the winter. But this excess heat of course is captured in summer, wehen you need to get rid of it. Seasonal heat storage is not easy. Passive solar greenhouses are promising with that regard.