I think this is a related topic, hopefully not off-topic.
If you feel the need to reduce the heat inside your JK, the outside may be the place to concentrate your efforts. I found that even on 70 deg days that the inside temp of the overall interior compartment was disproportionately HOT. Indeed, at 70 deg outside temp, often I could not hold my hand on the inside of the (hard top) roof panels (the factory options only offer black and gray, as far as I can tell).
So, I had the three roof panels sprayed "Jeep" white by Speedliner. Now, with the sun shining equally on one of the dark side panels and on the roof, the side is so hot I again cannot hold my hand on it, while the roof is COOL to the touch. This is a dramatic difference, making the interior compartment MUCH COOLER, and it also allows me to store the roof panels on their top sides without concern about rubbing or any other damage, esp. when driving rough gnarley trails.
Also, I feel free to toss stuff from the interior onto the roof without concern about doing damage to it.