Sea Water Air Conditioning, known as SWAC, offers a practical approach to energy efficient cooling in large coastal buildings. The system draws cold seawater from deep ocean levels, where temperatures remain stable year-round. This water passes through a heat exchanger, which cools a separate freshwater loop used to air condition interior spaces. The seawater never mixes with the building system, which keeps operations safe and controlled.
This method reduces the need for traditional compressors, which are the most energy-intensive part of standard air conditioning. As a result, facilities can cut cooling energy use by up to 90 percent. Hotels in tropical regions benefit the most due to constant cooling demand and easy access to deep ocean water.
SWAC works best in locations where deep, cold seawater is accessible. It requires higher upfront investment but delivers long-term savings through reduced energy consumption, lower fuel use, and decreased maintenance demand.