From here in the UK it is very difficult to give opinions on your situation. All I can talk about is my own experience with the plants. Here, the winter is cold, and plants outside need to be pretty hardy. My own orchids live mainly in pots on a north facing window ledge - north being the shady side. The plants seem happy to be there and I don`t have any issues with them. They put up with the central heating during the winter, and don`t need any direct sunshine in the summer.
I imagine they wouldn`t especially appreciate too much humidity, and that might well be the cause of the apparent mould on the one you have.
I wish you good luck with your plant, and hope it thrives.
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