Greenhouse growing in Arizona?

[amandarenee]

The hubby and I are going to be settling down in Arizona (in the Phoenix valley to be specific) permanently this summer, and I cannot WAIT until we buy a house and I can finally have a greenhouse.

But the hubbs brought up a good point: can I really grow orchids in a greenhouse in Arizona year-round? I am worried about cooking the poor little dears. I know you can get...um, that cloth that blocks out the light (I'm just starting my research in to greenhouses). And automatic vents. He also suggested that I might be able to use an evaporative cooler to help regulate the temp. So I would love to hear from people in Arizona (or anyplace with similar growing conditions). Gimme your !