Q: I am considering getting a small backyard greenhouse but I am concerned about it getting too hot.
A: A greenhouse is fun to have but sometimes you have to learn by experience what it takes to cool and heat it properly. Venting can help cool a greenhouse in the summer but a better way to do it is with shade cloth spread over the roof. Another idea is to locate it where deciduous trees shade it partially during the summer but give the greenhouse lots of sunshine in winter. Heating is a little less complicated because you can use an electric space heater in cold weather. More details at bit.ly/GAgreenhouse.