I think most of us, regardless of the outdoor temperature, keep our houses at a temperature that is comfortable for us humans and any pets we have. So in winter for many of us, that means artifically heating our house. Michigan is part of the country in the midst of a cold snap now, where daytime highs are in the teens, and this is supposed to continue for another week or so. I keep my house at approximately 70 degrees all winter. My indoor humidity is always lower in the winter than it is in the summer. Lately, it's been in the 20s. I do not have the option of raising the humidity, so the orchids are going to have to live with it. They all seem to be fine. I am watering more often than normal, every other day for most of them, and I mist those with aerial roots. This is the second or third Michigan winter for several of them. Two of my three phals are spiking right now, one of which already spiked and bloomed a few months ago. So I guess they're not too unhappy.
Greenpassion, you say you've been growing orchids for seven years (which is several years longer than I have). Did they survive the winter indoors in Vermont? If so, I think you may be worrying about nothing. Cold spells happen all the time, all over the world. It's not a big deal for plants kept indoors in a climate-controlled environment.
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