[Cynthia, Prescott, AZ]

Well, I assume you will be putting up some shade cloth that will help with the heat. I take mine off during winter, and back on in spring. Now about the bubble wrap. I found that the shipping store stuff that only last about 8 months is really great to diffuse the light, and allow my orchids to go to higher light levels before I have to worry about burning the leaves (the agriculture equivalent doesn't diffuse very well). This is what I am trying to find time to put up in my GH for winter, not for insulation, but to help diffuse the light to prevent burning with the removal of the shade cloth. In summer, I don't think there is any downside to having the bubble wrap up because the cooling in the greenhouse is done by ventilation, not by heat transfer thru the walls, which is insignificant. If you have heat problems in summer, I think the only answer is an evaporative cooler blowing thru the wall, tho I have never been in high humidity areas, so that may be different.