I live in Wisconsin and temperatures hit below 0. I'm growing tomatoes, peppers, lettuce, parsley, Kale and Chard right now. I can grow whatever I want because the temperature stays consistent. Everything is working is great so far. I made a video showing how to heat a greenhouse in the winter. Go ahead and watch if you have question. http://www.youtube.com/watch?v=UvSb9bXj2B0
I have the same heater in my greenhouse. Unfortunately because of high humidity they only last about four Years so keep an eye on it.
