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Simple HVAC Load Calculator that helps you easily determine the correct size of the HVAC equipment you need to install. Load Calculation: Manual J. Equipment Selection: Furnace and Air Conditioner. This example illustrates a permit application packet when the HVAC ContractorA load calculation program based on Manual J, designed to be quick and easy to use. It calculates the amount of heating and cooling BTU's needed for the Perform online ACCA Approved load calculations in minutes. Supports block load or room-by-room. 100% cloud based, can be accessed anywhere, anytime, The HVAC Load Calculator that's fast, compliant and free. Use our Cool Calc powered Manual J calculator for professional ACCA approved MJ8 reports. Our free, easy-to-use HVAC load calculator will help you determine the necessary thermal output capacity (in BTUs) of any residential building. The Manual J calculation is a formula that identifies the HVAC capacity of a building. It might also be called an HVAC load calculation because it describes the Leverage the Manual J Load Calculator tool from LennoxPROS and CoolCalc to produce free professional MJ8 reports.