again: solar radiation depends upon the 4th power of absolute temperature -- so not much difference between 155F and 105F, so not much affect of radiation either from 155F to 75F in thru the ceiling next to the attic.

this was affirmed by my best friend, a retired NASA rocket engineer, who was charged with determining the best paint for the fuel tanks for mitigating solar effects upon the fuel tanks during fueling -- Tom helped put man on the moon -- using slide rule & Merchant calculators -- BTW, the chosen paint was such that color had such little influence that the tanks could be of any color, or have any logo desired! Tom knew every flow system of the vehicle, and the heat transfers involved -- such that they could predict the preformance of new device designs.