https://communities.bentley.com/products/building/performance/f/hevacomp-forum/218553/heat-loss---simple-v-complex-modelCould someone let me know the main difference between simple and complex model when carrying out a Heat Loss calculation? I can see complex model does not let you chose between setting the air or resultant temp (fixed on resultant) - but the fabricen-USTelligent Community 12https://communities.bentley.com/thread/668139?ContentTypeID=1Tue, 24 Aug 2021 14:58:32 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:1f407235-7e6f-48aa-ba3e-1c97510d88a3Shane Regan<p>Hi James,</p> <p><a href="/products/building/performance/w/building_performance__wiki/31358/how-to-access-the-software-manuals">The manuals</a> would be the best resource if you wished to dig further into these calculations methods, some info from this can be found below:</p> <p><img alt=" " src="/resized-image/__size/640x480/__key/communityserver-discussions-components-files/275871/pastedimage1629817081177v1.png" /></p> <p>There you will also find all the formulae used, eg:</p> <p></p> <p><img alt=" " src="/resized-image/__size/640x480/__key/communityserver-discussions-components-files/275871/pastedimage1629817144238v2.png" /></p><div style="clear:both;"></div>