DX System Sizing Calculator

Size direct expansion cooling systems including refrigerant charge and airflow.

Required cooling capacity.
tons
Equipment EER rating.
BTU/Wh
Ratio of sensible to total cooling (0-1).
ratio

Results

Required Airflow-CFM
Power Consumption-kW
Approximate Refrigerant Charge-oz
References: ASHRAE Handbook - HVAC Systems and Equipment, Chapter 18 (Direct Expansion Systems)