Pre-renovation audit. Before starting the project, the developer of the renovation project can start the free online voting switch provided by EnergoRix that bridges the digital gap (switch, app, page) and continue with expanding the data with temperature (C), humidity (%HR), CO2 data in all buildings of the planned reconstruction. By reading the data before the renovation, one can objectively see its necessity and potential benefits, as well as evaluate the effectiveness and confirm the post-renovation benefits.