Is anyone familiar with the "50$ and up underground house book?" The author also does a book on Underground greenhouses. I think these would be fantastic! Keep chickens or rabbits penned up in a (heat sink-the lowest point in the room). Then they put Co2 AND heat in the air. This helps a lot in colder climates, letting you push your grow season months further, considering your ambient room temperature is roughly 55 degrees, without the animals, or any sunlight. Plus your animals are pretty safe underground, as are your plants, so long as you follow his guidelines in construction properly. Mike Oehler, definitely has a lot of great ideas and years of wisdom that we all could learn from.
