We have glass sliders enclosure and the solar curtains are installed inside. They may help a little, however, the heat has already entered the room through the glass before reaching the curtains (6 inches). So, they really would work better if the lanai was screened, then they would block the light/heat somewhat. Our lanai faces south and west, so it gets really hot. We had to install a mini split to make the lanai comfortable.
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