Greenhouse: small greenhouse heating question, 0 by erehwontim

erehwontim wrote:
One way to solve the problem is to insulate to keep the heat in. I think if you cover the whole greenhouse with plastic and make sure it is on the ground all around you will need a lot less heat. Water bottles probably won't store enough heat and it will cool very quickly. A stone floor will probably be better. Also string some christmas lights inside -- that will probably give you enough heat. If the picture comes out (my first try!), the box in the snow was made from foam insulation with an outside layer of plastic. I laid three strings of Christmas lights in the bottom and put the seedling trays directly on the lights. Now 20 degrees out and 70 degrees in! During the day when the sun was out I would take the lid off leaving the plastic on. On a really nice day I took the plastic off.