Input parameters
Method and scope
This screening model combines a climate-specific area allowance, ceiling-height adjustment, window allowance, and occupant allowance. It gives one whole-home number rather than room-by-room loads.
This is not an ACCA Manual J report and is not suitable for permitting, equipment purchase, duct design, or a rebate submission. A qualified designer must verify envelope areas, orientation, infiltration, design weather, latent load, ducts, and equipment selection.
FAQ
Is this an official ACCA Manual J calculation?
No. It is a transparent preliminary screening tool inspired by the inputs used in Manual J. A full Manual J requires detailed room-by-room envelope and design-weather data.
Why does it show CFM?
A common preliminary airflow screen is about 400 CFM per ton. Actual airflow depends on equipment, humidity control, duct design, and manufacturer data.
Can I size equipment from this result?
Use it only to prepare questions for an HVAC professional. Final equipment and duct selection require a detailed design.
Related tools
Cooling Load Calculator · Heating Load Calculator · Duct Sizing Calculator