Scan the house with your iPhone, run a room-by-room load, then draw and size the ductwork on the same plan.
Walk the floor once and let LiDAR map every room, with windows, doors and stairs sized and assigned to the right wall. No LiDAR? Tap each corner as you walk, trace a blueprint PDF, or type the numbers in.
Heating and cooling per room on Manual J 8th Edition methodology. Wall assemblies by layer with a framing correction, window orientation and shading, infiltration by tightness, duct gains and losses.
Lay trunks, branches and takeoffs by tapping the plan you just scanned. Every run comes back with a size and a velocity, sized to the friction rate that falls out of your blower's static pressure.
A PDF you can hand a customer or an inspector. Room-by-room tables, the duct plan drawn to scale, and a full takeoff behind it — outlet schedule, footage by size, fitting counts.