This greenhouse saved my potted plants. I live in southern Mississippi and we usually have a few nights that drop down below freezing. This past winter was brutal and I would have lost every potted plant if I hadn’t bought this. Our temps dipped into the teens for weeks at a time so I had to put a small space heater inside set to the coolest temp just to keep from freezing. It worked great and all my plants survived the coldest winter on record.