Given a surface energetic heterogeneity as the normal distribution function, the approximate analytical solution has been obtained that resembles the true isotherm at both low‐ and high‐pressure limits as well as reproduces its intermediate, so‐called centrosymmetric, point. An asymptotic complement property that introduces a continuous mapping of the isotherm onto itself has been formulated, proved and shown to be applicable to a whole class of surfaces. The limiting or degenerative cases on energetically homogeneous (the Langmuir case), evenly heterogeneous (the Temkin case) and quasi‐passive surface have been considered. The role of the heterogeneity parameters of the overall Gauss isotherm has been studied. An algorithm to determine the adsorption heat characteristics of the surface has been built. Hints for future use of the asymptotic complement property have been given.