Using the scalarly perturbed FLRW metric we investigate the effect of gravitational redshift on the CMB photons temperature. Having done this we investigated how the gravitational time di- lation due to the scalar perturbation in the metric affects the variation of this same temperature. Finally, we infer the result corresponding to the composition of the two effects in macroscopic formulation: the Sachs-Wolfe Effect (SWE). Having done this, we proceed to the analysis of this same phenomenology this time via a kinetic approach. Through this channel, in addition to the SWE, we detect the action of the Integrated Sachs-Wolfe Effect (ISW) deforming the CMB power spectrum.