Painting hard top top white to keep the interior cool.

[The Last Cowboy]

The glass is where the real heat comes from.

Plastidip is probably the safest and easiest way to experiment with this. If you don’t like it, peel it off.

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[aldo98229]

my soft top gets hot! went off roading on a mild summer day last year, had the a/c on full blast and i was sweating. i think the hard top does a better job of keeping the heat out.

i finally got my windows tinted with ceramic tint. so far its seemed to have helped quite a bit. the windshield is a big magnifying glass. i tinted it with a real light ceramic tint. that definitely makes a difference.

Since the OP is in Hawaii, my guess is he could be driving around with the side curtains removed if he had a soft top.

Of course security could be an issue, depending where on Hawaii he is.