Would you need a greenhouse in Orlando unless you are growing commercially? As few as 10 years ago there were citrus farms surrounding the Cracker Barrel Restaurant along I-4 near Plant City. 30 years ago all along I-4 was citrus groves. I would think an unheated, relatively inexpensive hoop house to use as a cold frame would be sufficient for the infrequent frosts you may have. You wouldn't need air-tight doors so you could install double doors on both ends that you can open for "through" ventilation. One of those large fans like they use in chicken houses would move the air through the hoop house or buy one of the water-cell fan coolers. I am certainly going to follow this thread to read advice submitted by folks around Orlando.

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For citrus I would get a pummelo, here is a pic of a hirado butan. I am in a colder area than Orando and do not protect my citrus at all, so they should do fine like the others have said: and here is some fruit coming: I believe white sapote should do fine. Other tropicals to consider that I think would work well without protection are jaboticaba, grumichama, cherry of rio grande, banana, canistel and cattley guava. You could grow a host of non-tropicals such as fig, low chill plum, peach, apple, jujubes, feijoa, pomegranate, persimmon, loquat, grapes, kiwi ect

Thanks Carol. I looked up Salix, willow and found hundreds. I believe one of them is what I am looking for.