[Pete-R-Bilt]

A person could in its simplest form just have a sprinkler system on the roof to chill it or better yet for the serious shielding get one of those tractor trailer reefer units, lay a grid of PEX tubing on your roof, lay another layer of OSB, tarpaper roofing paper or whatever your roof is.

Do that, and you better have something covert and nefarious going on to afford the fuel and maintenance you'll spend not to mention in Cal. it'll have to be CARB certified.

UNNGGH!

[MrB]

The funny thing is, when you water your roof to take advantage of evaporative cooling,
you’re making a REAL “greenhouse gas” - water vapor - in order to avoid using electricity, whose production involves making the faux greenhouse gas of CO2.