Bentley Tas Simulator V8i is based on a custom-designed simulation engine and is the high-speed performer for complex buildings. Bentley Tas Simulator V8i also shines at evaluating a wide range of passive design features such as operable windows and other types of passive ventilation.

Bentley Tas Simulator V8i is used extensively in the United Kingdom for compliance checking with Part L of the building code, and can also be used with ASHRAE 90.1 and LEED in the US.

Bentley Tas Simulator V8i is targeted at engineers, architects, and energy assesors who want a tool that is robust and productive. Bentley Tas Simulator V8i offers cutting edge tools for the most accurate building and plant simulation, especially for LEED and U.K. Part L compliant buildings.

Bentley Tas Simulator V8i gives building professionals three tools in one package: a design tool, compliance tool, an FM tool, as well as the ability to import gbXML from Bentley Architecture, Bentley Building Mechanical Systems and Bentley speedikon Architectural. In addition, the software direct data exchange between Bentley Tas Simulator V8i and Hevacomp Mechanical Designer V8i is possible, and it has a robust and comprehensive passive design capability.