Light could also be a factor, as light intensity rises in the summer as well. Does your orchid receive more light in the summer time as well? I guess the only real way of controlling for light is to grow under lights in a basement.
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All that is gold does not glitter,
Not all those who wander are lost;
The old that is strong does not wither,
Deep roots are not reached by the frost.
-J.R.R. Tolkien, LOTR, Fellowship of the Ring
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