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High-Volume, Low-Speed (HVLS) fans were installed in a typical Southeastern US dairy free-stall barn, in addition to a more traditional High-Speed fan ventilation system. The systems were installed so that different sections of the barn can be ventilated using different cooling systems. Foggers were used in addition to fans to provide extra cooling under extremely hot conditions. Air speeds were more uniform throughout the barn, but were significantly lower in critical areas with HVLS fans as compared to conventional fans. Because of seasonal time limitations, only one set of data was taken in the fall of 2004. This preliminary data indicated that the internal temperature of cows cooled with HVLS fans was approximately 0.2o C (0.3o F) higher than those cooled by conventional high-speed fan ventilation.