My hubby and I are starting to look into a greenhouse. We want to be able to use it year round not just for starting stuff in the spring. We found one that we are considering but then my neighbor (who raises lots of goats) sent me this link. Any one ever tried one like this. http://www.farmshow.com/issues/29/01/290106.asp I asked about heat and this was her reply: For heat. A large Black Barrel full of water...when the sun shines it heats up, and disperses it's heat at night. during really cold weather you can put a space heater with fan that blows hot air at the black barrel. You use can use a black mesh shade cloth over the top at night to keep the heat in......and grow lights inside also for heat during really cold snaps. manure can also be used to generate heat...I have enough of that........<G> ......or wood shavings mixed with compost will do the same thing. To get heat out in the summer time you install a box fan on one end and it pulls the hot air out.....and instead of plastic you use white mesh to cover the greenhouse...lets light in and reflects the heat of the sun in the middle of summer. I sure would love to see pics of any of your greenhouses and hear ideas of how you handle heating/venting/cooling etc.. We have a space that a 14'X 50' greenhouse would fit, but a limited budget. The one we are looking at falls into our budget and is inclusive of heater, vents, etc. But if we could save some $$$$$ we would be really happy. Any ideas or suggestions?