How warm does it stay in the winter? How hot does it get in the summer? I'm in Zone 6b and on a sunny day in the winter the temperature can rise about 30 degrees above the outside temperature. This is heaven when it’s 30-40 degrees Fahrenheit because the greenhouse feels like a spring day. It's situated on the north side of my house and is partly in the shade so your results may vary.
On cloudy days, the greenhouse temperature is about the same as the outside temperature - but minus the wind and minus the frost. I don’t heat my greenhouse, but some people do.
For cooling and airflow in the summer, I use an outdoor-rated fan. To lower the temperature a little more, I hung burlap overhead. All of these items are listed on the Greenhouse Materials List page.
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