Any examples of geo-thermal or climate battery greenhouses in cloudy/frigid areas?

I'm researching greenhouse styles and I'm not sure a climate battery will work where I live. In northern Wisconsin we are cloudy most of the winter (January solar gain of 2.5 kWh/m2/day) and zone 4. Seemingly similar climates for clouds AND temps are far northern Maine, VT, NH and NY and the northern half of MN, ND and MT. Many areas of Canada, Russia, etc are probably also similar but I don't have climate maps for them.

I have seen wonderful examples on Youtube of the CRMPI greenhouse in CO, one in NW Nebraska and a few other places that seem plenty cold but also fairly sunny. If you know of cloudy/frigid examples, I'd love to hear about it.

My goal is to build a 19' by 32' greenhouse that can hopefully support tropicals or at least Mediterranean trees.

On a related note, I'm a bit fuzzy on how the system heats in the winter. Does it actually store the heat you send underground in the summer so that you can draw it out 6 months later? Or does the hot air you pump down in the summer dissipate and in the winter you pull up the ambient ground temperature which is 50F or so?

Thanks!

We're in a zone 5-6 area with long periods of cloudiness in winter (temperature inversions)

We're in the process of building a 62x28ft earth sheltered greenhouse. You may find this article about it useful in your thought process:

http://windward.org/2.0/notes/2015/2015andrew06.htm


I am still trying to figure out the relative utility of the earth tube systems. Sorry I can't be of more direct help.