Other factors include how it ages, w.r.t. thermal emittance (emissivity) and solar reflectance (SRI). See the "3 years" columns here: https://coolroofs.org/dire

Other factors include how it ages, w.r.t. thermal emittance (emissivity) and solar reflectance (SRI). See the "3 years" columns here: https://coolroofs.org/directory https://coolroofs.org/directory Many products drop by several % after a few years.