Hobby Nature 6' x 8' Greenhouse Kit - Silver is designed with twin wall polycarbonate panels which has the added benefit of twice they keep retention of single layer panels. If you love planting all year round placing a heater during the cold winter months will allow you to enjoy your hobby almost all year round. Nature silver greenhouses have the capability of collecting rainwater from their gutters so that you can water your plants with fresh rainwater you've collected. We offer discount pricing for all our greenhouses. Look for greenhouse kits on sale at budgetpackaging.com.