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It is 14F/-10C outside and 59F/15C in my house this morning. Time to turn on the heat I think.
I have a tube greenhouse frame, but I don't have greenhouse plastic film. I also have access to a second tube greenhouse frame. If the first works well and I can support it correctly, I'll get the second one. I can use polytunnels inside them as well. Combine that will get me to about Zone 7 without extra heat. Maybe to Zone 8 if I get enough black-painted water containers into it.
I wish my area had a greenhouse program like others, where they pitch in some money for greenhouse building that are putting food stuff into the local market.