Keen Manual J — Quick Estimator
Keen Manual J — Quick Estimator
Fast rule-of-thumb sizing to speed up quotes (not a full ACCA-approved calc).

Project Inputs

Enter a few basics. You’ll get heating & cooling loads with a suggested tonnage.
Total heated/cooled floor area.
Sets base BTU/ft².
Adjusts both heating & cooling.
Adds internal gains (~600 BTU/h each).
Rough internal gains (default 1200).

Heads-up This is a rapid estimator to triage sizing. For permits/designs use full ACCA Manual J/S/D.

Results

Numbers auto-update when you calculate.
Cooling Load
Heating Load
Suggested Cooling Size
Suggested Heating Capacity
Notes Enter inputs, then click Calculate.
Send to Component Estimator