Yes, there are several Revit plugins that can help you calculate the thermal insulation of building parts. Some examples are DesignBuilder, eQuest, and Energy3D. The latter is a free plugin that allows you to design and analyze the energy performance of buildings in Revit. It includes tools to calculate the thermal insulation of walls, roofs and windows, as well as the overall energy performance of the building. DesignBuilder This is a paid plugin that provides a set of tools for analyzing the energy performance of buildings in Revit. It includes functions for calculating the thermal insulation of various building components, as well as tools for analyzing heating and cooling loads and energy consumption. eQuest is a free plug-in for creating detailed energy models of buildings in Revit.