My greenhouse has become a favorite place for me to work on most days. From watering, seeding to transplanting there is a lot of activity in the greenhouse.
But I am struggling with keeping my temperatures within an acceptable range.
When it was cold I had to add a heater to keep the temperature above 40. I let the temp drop into the 30s one night and lost the tomato plants I had in the ground. This of course is a manual process and adds the cost of electricity to my gardening efforts.

When the temperature gets too hot I have another problem. The greenhouse will heat up in a hurry and the extreme temperature will kill off any tender seedings, and even some things in the ground.
I have a window that opens when the temp gets above 75 degrees and will leave the door open for ventilation. I have a small fan in the greenhouse to help with air flow, but it is not really big enough to keep the temps down.

Today I added a shade cloth that is supposed to block 70% of the sun’s rays. Too early to tell if it will be helpful, but got to try something!

I also have a thermometer that registers the high and lows. This is helpful as a reactionary tool, and give me some insight as to what is happening in the greenhouse.

These are my attempts and regulating the temperature in my greenhouse.
I would love to hear what methods you use to keep things around an optimal temperature. Drop you comments below if you would……