Setting up for cool growing orchids.

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Hello, I figured I'd start asking because I seem to innately be attracted to orchids that are termed as 'cool growing.'

I live in Ottawa, Canada and the current temperature right now is 1 degree Celsius, rather pleasantly warm for this time of year.

My main growing position is a set of shelves and a desk set directly in front of my South-facing bedroom window. My bedroom gets cold enough at night that I tend to sleep with two blankets, although since I am a wuss to cold it might not be that bad. House temperature is normally kept at about 70 degrees F.

I do not at this point in time have a temperature gauge to check min-max temperatures, but I'm looking for suggestions on how I could set up for cold growing orchids, and indeed if I have any options.

A picture of my setup can be found at: http://photos-e.ak.fbcdn.net/hphotos..._6782804_n.jpg

It should also be noted that my windowsills are tiny, tiny narrow little things not designed to hold anything...

Any suggestions or are cold-growers doomed?