Recycling Heat:

When the new Recreation Center was built around the existing pool, metal coils were placed inside the ventilation system. Because the pool water is kept at a constant 82 degrees, the air becomes warm and moist. Due to state regulations, some of this air must be pumped out and replaced with fresh, outside air. Rather than losing all of that potential heat, designers decided to utilize this moisture, or "recycle" it to use elsewhere in the building. Thus, the metal coils capture this moist heat and use it to warm up incoming air for other parts of the building. Similar systems are used in both locker room showers as well.