There are aftermarket solutions which can block the sun. The Koger Sunshade is one which is commercially available in a few places. Alternately, tinted cling film works.
Personally, I've never been hot in the airplane other than at very low altitude in >90F weather or sitting at the runup line with the canopy closed in similar weather.
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Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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