I haven't put shade cloth on, but I do take the doors off and open the vents during the day. Also have fans running all the time. We don't get extreme hot temps, so having the air movement seems to be ok. I have some heat lovers in there. Hoping that the moonvine and butterfly pea vine actually produce flowers for me. In past years, I have not had flowers on either when planted outside, so we will see. I nights are very cool, even when we have hot days. I also have some peppers, basil and tomatoes in the GH.
