My climate similar to a British climate. I use my greenhouse January through May to start seeds/plants/mostly annuals and vegetables. I also overwinter a few plants in there. In the summer, I leave all the doors and windows open, day and night, as it is way too hot in there to grow anything, and we don't get any rain July/Aug and most of September.
I heat the greenhouse with an electric heater that maintains a minimum temp of around 50.
Technicalities of variations in temps at the floor vs. the ceiling really matter very little in a small greenhouse, except for perhaps the most finicky of plants/seeds.
I love my greenhouse. It's paradise for me in there, and a peaceful sanctuary.
