How it works
Define the Building
Enter rooms, dimensions, and construction details. Select from pre-built assemblies (2x4 frame, SIP, ICF) or build custom. Enter blower door results or use Manual J defaults.
Calculate Loads
Room-by-room Manual J calculation with ASHRAE design conditions for your ZIP code. Sensible, latent, and total loads for every room — with component breakdown showing exactly where heat enters and leaves.
Size Equipment
Manual S matches your loads to real manufacturer models within ACCA sizing limits. Compare up to 5 options side by side — capacity, efficiency, cost, and SHR match. Heat pump balance point analysis included.
Design Ductwork & Generate Reports
Manual D sizes every supply and return duct based on room CFM and equipment static pressure. Generate permit-ready PDF reports for J, S, and D — or a combined package ready for the building department.
Ready to get started?
Free during beta. Join the waitlist for early access.