Q=Area (sq. ft.)×Heat Load Factor (BTU/hr per sq. ft.)cap Q equals Area (sq. ft.) cross Heat Load Factor (BTU/hr per sq. ft.)

The proper text, formatted as a title or heading, is:

Where ΔT is the temperature difference between supply and return air (typically 20°F for cooling).

Excel can compute essential air properties if you input dry-bulb and wet-bulb or RH.