Mark Ens

Thank-you very much for your input. I'm guessing that your insulated up the walls and well down below the frost line with a r-factor of 25, or more?

Any more thoughts or ideas?

Thanks for you input. I don't want to insulate it from the bottom. I don't want to insulate it from the ground,,thats where I want to get my heat from.

The hole would be the same size as the greenhouse on top. I'm thinking about 8 feet wide by 12 feet long. The foundation would be pored around in the bottom of a 8 foot hole. A wooded insulated wall built on top of that, up to the ground level,, then the hole filled back up with earth. The greenhouse itself, built on top of the "basement" wall.

Anybody else? I really want to know if anyone has done this, or knows of someone who has. I'm wondering if the geothermal heat plus the solar of course, will keep it from freezing. The walls will be insulated from 8 feet down, right to the top of the greenhouse.

I would like thoughts on this. I want to dig a hole down 8 feet. Then pour a foundation. Then build a wooden 2x8 wall. Insulate it and poly on the inside. THEN,,, fill the hole back up. Then build a 2x8 building on top of the basement wall. glaze the south side, maybe some of the east and west walls also. Insulate the rest. Superseal it as well. It should never freeze in there, right? I live in central Saskatchewan -40c, in the winter, and up to +40c in the summer.