Valentin Software GmbH specializes in precision planning tools for renewable energy systems, focusing its portfolio on heat-pump design and simulation. Engineers, HVAC consultants, and energy planners use GeoTSOL to calculate seasonal performance, borehole lengths, and hydraulic configurations for ground-source and hybrid heat-pump installations. The application combines climate data, building load profiles, and geological parameters to generate yield forecasts, economic analyses, and compliance reports required for German and European subsidy schemes. Interactive graphs and 3D ground models help visualize temperature fields and heat extraction rates, while automatic sizing wizards reduce iterative hand calculations for residential blocks, commercial districts, or single-family homes. Typical projects range from retrofitting existing oil boilers to low-temperature heat pumps up to planning large collector fields beneath parking decks or sports facilities. Both GeoTSOL 2025 and the forthcoming GeoTSOL 2026 share the same calculation core but differ in database updates, regulatory templates, and interface refinements, allowing offices to migrate gradually without interrupting ongoing projects. Valentin Software’s applications are available for free on get.nero.com, where downloads are delivered through trusted Windows package sources such as winget, always installing the latest released versions and enabling batch deployment of multiple programs.