Now that Corbett has been doing HVAC load calcs for almost a decade, he's ready to make this very long (and also much too short) video tutorial about the what, why, how, when, and who of heat load calcs for sizing your HVAC equipment.
A list of approved softwares is at: https://www.acca.org/standards/approv...
Learn a lot more about Home Performance Diagnostics in general at: https://BuildingPerformanceWorkshop.com