Free HVAC Calculators & Tools
Practical calculators for AC sizing, ventilation, refrigerant charging and copper pipe selection — written for UAE conditions and linked to the products you will need. Each tool works on mobile and explains the method behind the numbers.
AC BTU / Cooling Load Calculator
Room size, ceiling height and sun exposure → BTU/h and the split AC tonnage you need.
Duct / CFM Calculator
Air changes per hour → CFM and m³/h, then the round duct size and matching inline fan.
Superheat Calculator
Suction pressure + line temperature → superheat for R410A, R22 and R134a with diagnostics.
Subcooling Calculator
Liquid-line pressure + temperature → subcooling and charging guidance.
Copper Pipe Size Helper
Unit capacity + pipe run → liquid/suction line sizes and how many coils to buy.
How to use these tools
Start with the BTU calculator to size a room, then pick a unit from AC units and use the copper pipe helper to buy the right coils. For ventilation projects, the duct / CFM calculator points to the correct VENTS fan. Service technicians use the superheat and subcooling calculators when charging R410A and R22 systems with refrigerant from our catalogue.
