Hi,

You probably want to post this on the Discussions side of the orchid forum (this here is the off-topic side).

Winter care depends in part on what kind of orchids you are growing, because some like to stay above 70F, while others actually are native in places that freeze. Presumably you have tropicals, but still some like to go down to the 40s....

So I suggest reposting on the Discussions side with a list/description of what kind of orchids you have.