Yes the sun shades do decrease heat from the sun. We have a south facing lani - installed 90% blocking and definitely feel the reduction in direct heat. Check RK Sunshades before you make a final decision. They are a little more expensive than the others, but in my opinion have the best product. FYI we had motorized screens in Atlanta Ga. (10 years of experience) - got 3 estimates here - prices were about the same but the product from RK was superior compared to what we had in Ga and the other companies in this area.
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