i have the same problems, more or less....2 walls are on the house and garage. mine is as big as I could make it...8x16...with the short side facing east, and the long side north. it works for me, as the evening sun in north texas is extreme. and the south is the same.
as I love my cattleyas the most I have to hang the mature plants up high on the rafters to cook them enough.
to counteract the heat (it is over 100 degrees already), I have a humungous exaust fan to pull heat out. it is on the long north side, high as I could hang it. on the east end, I have a large evaporative cooler which runs A LOT! on high....I also have a jaybird 700 mister on the corner n.e. I can only hope to keep the temps around 90 at best, as that big exhaust fan (36"!) sucks the humidity right out with the heat!
its a challenge in this climate, and it took a year of thought....to place equipment to maximize climate control....you can see some of my work in this forum...my first gh here was a 5x8 enclosed porch. it could not be heated efficiently for orchids.
good luck!
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