This was here when we bought the house. It's pretty state of the art. It's about 30 ' in diamiter , 15' high, four windows that open when it gets hot ( some special wax in the plungers) fan that circlulates air in the dome and thru the ground, has a small pond that helps keep the temp constant, the north side is insulated with reflective insulation. It's made of sort of a dual pane plexiglass with east west and south side exposed. All though we've lived here fo 5 years. this is my frist full season grow. I had two small harvests since Feb. Kind of Bonsai pot plants. I put a sour diesel clone in too early, it flowered and then went back to veg and is about 5' now. Ialso had a strawberry kush. Am hoping to do better with this crop.