Searched the archive but couldn't find an answer to this one: What is the best strategy for modeling dynamic external window shading? We have an office building design in Europe with large south window exposure, and dynamic shading is a key part of reducing their cooling loads. In reality we have external horizontal blinds controlled on a solar irradiance value. So far my best effort is the internal shading with a schedule, where schedule has a reset control based on outdoor DB being higher than cooling set point. This is not giving realistic results, I think the heat is being dissipated into the interior space from these interior blinds. Any successful modeling strategies to recommend? Thanks, Marcus -- Marcus Jones, M.Sc., LEED?AP BD+C *Freelance energy consultant* *Vienna, Austria*