Which statement accurately describes design cooling load?

• A. The energy required to maintain the design temperature in summer at the design outside temperature based on climate zone
• B. The energy required to maintain the design temperature in winter at the design outside temperature
• C. The energy required to cool the interior only during spring
• D. The energy required to power ceiling fans

Answer: (B)

Design cooling load is about how much heat must be removed from the building to keep the indoor temperature at the design level during the hottest, design outdoor conditions for the given climate. That means it uses the summer design outdoor temperature so the calculation reflects the peak cooling needs of the building. It’s tied to climate zone because hotter design summer conditions require more cooling.

This concept is distinct from heating load, which uses the winter design outdoor temperature to determine how much heat must be added to keep the interior comfortable. Spring isn’t the focus for the cooling load—design cooling is based on the peak summer condition. Ceiling fans aren’t the cooling load themselves; they can reduce the energy needed for cooling, but the design cooling load represents the amount of heat that must be removed by the cooling equipment under design summer conditions.