Go to the winter camping forum and read up - theres lots of general winter camping info there - do not do this unprepared. I recently started a thread about camping on your back porch. You will need easy access to a bathroom, boots and coats (and flashlights)where they can be easily found at night. lots of insulated pads and stuff, but the point is that its lots of fun to camp in the snow in your own yard where you can go into the house.
Jim
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These are my own opinions based on wisdom earned through many wrong decisions. Your mileage may vary.