Heat and cool your greenhouse renewably using the soil | Ceres Greenhouse

This is what they designed in Sweden.  A GAHT™ system allows the greenhouse to provide its own heating and cooling using the energy of the sun, and the soil underground. The result is a renewable climate control system that both heats and cools the greenhouse at a fraction of the cost of traditional HVAC.

Heat and cool your greenhouse renewably using the soil | Ceres Greenhouse:

Below is the low tech passive version of a water heat sink but it lacks control.

Another issue is off course heat loss out the roof.  So it is recommended that the top of the greenhouse be better insulated and translucent to limit gain in the summer with directly overhead sun.  Light is less important in the summer and plants will appreciate the filtering.

We had been considering a standard greenhouse with a conventional design but if our plan is for efficiency the we should design it for the specific site.

A link to mother earth news article on green house is here: How to Design a Year-Round Solar Greenhouse - Organic Gardening - MOTHER EARTH NEWS: