This study is an example methodology providing energy cost of office buildings complying with the LEED credit, EQc2, Increased Ventilation, that prescribes outdoor airflow rates that exceed ASHRAE Standard 62.1-2004 minimum rates by 30%. Office buildings in Portland, Ore., Chicago, Phoenix, and Atlanta, are modeled using eQUEST®, a freeware building energy use analysis program designed to estimate energy consumption of proposed and existing buildings using an hour-by-hour simulation procedure.