Porous Polymers Coating (PPC) exhibit excellent PDRC performance. These polymers have a high concentration of tiny pores, which scatter light effectively at the boundary between the polymer and the air. This scattering enhances both solar reflectance (reflecting more than 96% of sunlight) and thermal emittance (emitting 97% of heat), resulting in a surface temperature that is six degrees cooler than the surroundings at noon in Phoenix. Additionally, this process is solution-based and can be easily scaled up. A new design for PPC coloring is discovered. The dye of desired color is coated on the porous polymer. Comparing to traditional dye in porous polymer, which the dye is mixed in the polymer, the new design can have a higher refractive index of infrared and heat.