I did a search and see some of you guys have hF greenhouses. We have 1 and have been wanting to use it in the winter and early spring. Would love to use it know but how do you keep the temp above freezing? Ive got kitchen windows and bathroom windows full of peppers and tomatoes. Im to scared to leave them in there at night. Were in zone 6 sw mo. I think we finialy are warming up so everything is going out and i might leave them over night as night time temps are going to be above 30.