Hey.
Welcome.
Here's a post on pigments that reflect more 'light' (IR) back into space than they absorb, to the tune of 100W per square meter IIRC, of 'aircon'.
https://ecomodder.com/forum/showthre...tml#post675205
Something most seem unaware of is that a white dashboard, reflecting in the windscreen is a non issue if you are wearing polarized glasses.
ie: The reflection just disappears! Magic! Cool and anti theft ala-ding-dash!
I also NB that the way to ...'activate' charcoal, as found in traffic exhaust filters is to heat it up to red hot.
Now that's exactly how the charcoal was made in the 1st place, so 'Activated' is just a word tacked on so people can tack extra zeros onto the price too!
That might save you a couple of $$.
More important seems to be the structure of the organic you make charcoal from and Bamboo charcoal is said to resemble carbon nanotubes or somesuch, making it a more effective filter.