I can't answer your question. But I have always wanted a greenhouse. So on my last birthday my children surprised me with a 6x8 Harbor Freight. Now I have put it up within the last couple of weeks lacking benches but working on that. ( Have realized with age you move a bit slower) But I hope to be able to try a few winter tomatoes in the e-buckets along with a couple of other plants. Now I am in a warmer zone than you and hope I won't have to use too much power to warm it.
I feel like all gardeners we at one time or another wish for a greenhouse and for the price they sell these kits for you can't beat it. Good luck
