Today we talk with HVAC design legend Russ King (https://kwikmodel.com) about how to trim the fat out of heat load calculations in Manual J (and how you sometimes can't), along with fine points on duct design, grille selections, and a brand new movement in software to help homeowners perform their own load calculations (https://DIYloadcalcs.com). Hosted as always by Corbett Lunsford (https://BuildingPerformanceWorkshop.com). See the first-ever TV series about the Science of Homes at: https://HomeDiagnosis.tv