Hello everyone, I am new to this board, and, also to building a small green house. It was from harbor freight, the 299.00 6x8. I am going to place it on a concrete pad that is in my yard and also increase headroom by building a base with 4x4's or 2x6's. I live in NJ and would love to extend my growing season by heating my greenhouse. I am in no means rich, so I need a way to heat it by either solar panals of some type of using a water system to heat. HELP !!!!!!!!!!