The article presents a method for modeling the response of a class of thermorheologically complex viscoelastic materials. For the type of materials considered, all temperature effects can be correlated through horizontal and vertical shift factors. In addition, the proper evaluation of transient temperature response requires the vertical shift to be represented as a product of two temperature‐dependent functions. It is shown that, in order to obtain complete information, it is necessary to conduct sharp temperature‐drop tests in addition to isothermal creep and recovery experiments. The method and its use are demonstrated for the specific case of Hercules 3502 epoxy resin.