This Resource describes the capacity (heating or cooling) of a HVAC system. ‘capacity’ is a number in units of kW (kilowatts). To convert from kW to other units that may be commonly used in certain geographic locales the following conversions should be applied: – to convert to BTU/hr: BTU/hr = 3412.142 * kW – to convert to ton: ton = kW/3.5168525