In 1994, the first commercial application of surfactant drag reduction was conducted in Japan for the air conditioning system in the Shunan Regional Industry Promotion Center building. A commercially available drag-reducing additive (LSP-01) based on the mixture of a cationic surfactant, a counter ion, and corrosion inhibitors was developed based on the results of the project. Since 1995, LSP-01 has been used at more than 180 sites in building air conditioning systems throughout Japan. The drag-reducing technique was adopted recently for an air conditioning system in a skyscraper in Tokyo. Here, I measured the drag reduction and heat transfer characteristics during the cooling operation of a heat exchanger for a surfactant and a counter ion system, Ethoquad O/12 and NaSal. The analogy between the momentum and heat transfer for the drag-reducing flow is also discussed.