So with all the master orchid growers knocking about the forum, I thought I'd appeal for info/help on greenhouse setups. I'm planning on building in Los Angeles a 12'x16' greenhouse with twin-wall poly and a 3' kneewall since I'm pretty tall and like the extra headroom. In my area, the highest temp is around 100F and lowest is 40F. Building the actual structure isn't what I'm concerned about, but rather the environmental controls. I'm mainly interested in your opinions about what I actually need for a GH this size: exhaust fan system versus auto vents, evaporative pad coolers versus under bench misters versus humidifiers, RO systems, circulation fans, heaters, etc. I grow mostly Angs, so an intermediate GH is what I'm shooting for here. Your opinions are greatly appreciated!