load calculating
Load Calculation for sizing the AC / Heating System and Ductwork.
The amount of cooling produced by a home air conditioner compared with the electricity it consumes is its energy efficiency ratio (EER).  The higher the EER rating, the more efficient the air conditioner. National appliance standards require room air conditioners to have an energy efficiency ratio (EER) ranging from 8.0–9.8 or greater, depending on the type and capacity, and ENERGY STAR® qualified room air conditioners have even higher EER ratings.