SSFM International, a civil and structural engineering firm in Honolulu, is located in a former warehouse built in 1919. The firm needed to improve thermal comfort in the two-story building. Additionally, it wanted to show its commitment to sustainable building. Therefore, SSFM decided to do a solar thermal retrofit of its five-year-old air-conditioning system to achieve both goals. The project resulted in energy savings of nearly 65,000 kWh/year.