Air Conditioning Load Calculator
When sizing a cooling system, rule of thumb measurements can yield an improperly sized system. Poorly sized HVAC system can lead to an uncomfortable living environment and higher bills…

Manual J and Manual D: The Correct Way to Size a System

Links
Indian Society of Heating Refrigerating and Air Conditioning Engineers Worksheet
Download calculation spreadsheets and manuals here
HVAC Load Calculations
Online HVAC Calc