2 months ago I went to Lowes and purchased and installed the manually operated coolaroo to the EXTERIOR of my sun room windows. The research I had done on the internet said that installing them OUTSIDE the glass is the best way to keep the heat out. I'm sure to some degree they work inside as well. However, I can tell you that I'm glad I did mine outside the glass because it really has blocked the heat from entering the sunroom. Also, I did have to also install a mini split which is capable of heating and cooling and I do have to use that as well. The combination of the coolaroo and mini split make my sunroom perfectly comfortable. It is a pain to go outside and manually move them up and down....but nothing is perfect.
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