If you are in the southeast US, I would doubt that you need a humidifier. Don't worry about "bad air" for growing outside. I have a yard full of orchids in southern California... Pests are another issue... and rodents. But if you can avoid those, outdoors is really better as long as temperatures are in range. This species comes from a region where there is a large temperature range - the Baker culture sheet gives a range from 104 deg F to 38 deg F. So unless frost is a danger (when it will need to be brought in) I suggest growing it outside. I have a very small greenhouse, have found that anything that can grow outside does better outside.
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