I purchased a Snap & Grow Greenhouse - 6' × 8' from Sam's Club in October, 2009. I utilized an electrical drop cord and a medium sized space heater to keep the temperatures in the upper 40's to mid 60's throughout the winter months. Now, I am trying to figure out a way to lower the afternoon temperatures so that the greenhouse will not get over 95 degrees in the summer months....we had a brief heat spell here the past few days and the temperatures actually got up to about 122 degrees inside the greenhouse when it was in the lower 90's here. I have purchase an automatic vent opener but the vent being open still was not enough to keep the temps from reaching 100 degrees. I really want to put my dwarf Citrus trees in the greenhouse during the spring and summer months and part of the fall. I have also purchased an adjustable 40% shade cloth kit that lets through 60% light. I would expect this to help out with the over heating but would my trees get enough light? Thanks, Tim.