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HVAC Heat Load BTU Calculator helps HVAC technicians, engineers, and contractors calculate accurate cooling and heating loads. Calculate accurate cooling and heating loads using a simplified ACCA Manual J methodology based on room dimensions, insulation levels, window types, and ASHRAE climate zones - the industry standard for professional air conditioning system sizing. LOAD CALCULATION MODES: Cooling Mode - Calculate BTU/h cooling requirement for air conditioning Heating Mode - Calculate BTU/
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