The high today is 101 degrees Fahrenheit which translates to 135 or more in a greenhouse. If you are using the greenhouse through the summer months that is just too hot to grow in. If you are using the Greenhouse , like I am , to store pots , potting soil and garden tools it just to hot. How to beat some of the heat is to install a vent fan. There are many choices out there at many price ranges. We have power in the greenhouse so a electric louver fan with a thermostat control works well for us. We also installed a 50% shade cloth on the roof side that gets the mid day and evening sun. This made a huge difference in the temperature.
Just remember the vent fan is there to displace the heat in your greenhouse. We put the fan as high as we could pushing air our and have a floor level opening to allow heavier cooler air to be pulled in to the greenhouse. We have a small vintage floor fan sitting in front of the floor vent to help pull more air in.
We also have a few windows that will open to help with air flow. Early in the spring the small vent worked great at maintaining a decent temp. However with the dog days of summer upon us we had to open a few windows to keep the temp only a few degrees hotter than the outside temperature.
Luckily in zone 8 we have a long growing season and do not need a greenhouse to grow in. We have somewhat mild winters and found that a grow mat was all I needed to start seeds with and maintain seedlings. I remember only a few nights of having to bring in seedlings. We have discussed heat methods with out a decision yet. That will hopefully make another post later in the season.
Hope your gardens are green!
Sheryl
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