I grow outside in summer while temps are above freezing. Then they go into a coldframe, attached to the side of my GH, with a very small hole into the GH at each end. The lid opens and closes with a heat motor, and a small clip-on fan comes on with the GH heaters, same thermostat, blowing down the length of the coldframe, greating a slight pressure from one end to the other, and causing a small air exchange with the GH.
I picked up two new Cymbidiums from SBOE this fall, a Thethy's 'Black Magic" and a Ricon "Clarisse" 4N, both in late bud stage. So of course these went into the living room to enjoy, instead of the coldframe. Very interesting was that the Thethys began to drop buds, one by one, while the Rincon buds carried on and started to open. Finally had to put the Thethys out into the coldframe, and was able to save the last 3 flowers. Both were undoubtedly in the same conditions in Santa Barbara, but they reacted differently in a home. The Rincon has been supporting 4 magnificent spikes with no problem in my relatively low light living room. The Thetys is back in the living room with the 3 flowers, now that they are open, with no problem. I would say that one is OK for home growing, and one is not, provided you have enough light. On the other hand, the warm growing Cyms like Dag and dayana, I would expect to do OK. My pbase site below, with some of these Cyms. Also, my section on my temp GH, with pictures of the coldframe. Cynthia
http://www.pbase.com/schnitz/orchid_collection http://www.pbase.com/schnitz/temporary_greenhouse