HVAC calculators
BTU cooling load, airflow CFM, duct sizing, heat loss, air changes and operating cost.
HVAC
BTU Cooling Load Calculator
Estimate air conditioner size in BTU/h, kW and tons for a room.
HVAC
Airflow CFM Calculator
Required airflow in CFM and m³/h from room volume and air changes per hour.
HVAC
Duct Size Calculator
Round and square duct size from airflow (CFM) and target air velocity.
HVAC
Heat Loss Calculator
Design heat loss of a room or building through walls, windows, roof and floor plus ventilation air.
HVAC
ACH Ventilation Calculator
Air changes per hour (ACH) from room size and airflow, and the airflow needed to reach a target ACH.
HVAC
HVAC Operating Cost Calculator
Electricity use and running cost of an air conditioner or heat pump from capacity, efficiency and runtime.