Takashi Kadokura used to strip down to his underwear when working late because of the heat.

“We couldn’t concentrate on our work,” said Kadokura, 37, then an economist for Dai-ichi Life Research Institute in Tokyo. “The air conditioning was set at 28 degrees and we weren’t allowed to change it.”

The experience led Kadokura to question the government’s Cool Biz policy, which recommends companies set air conditioners at 28 degrees to reduce carbon dioxide emissions. Kadokura says sweaty offices lead to lower productivity, and estimates the policy reduced economic growth in 2008 by ¥653 billion, or 0.13 percent of the gross domestic product of ¥497.4 trillion.

Cool Biz was created as part of the government’s pledge to cut greenhouse gases emissions by 6 percent in the 22 years starting in 1990 as part of the Kyoto Protocol.

Toyota Motor Corp., Panasonic Corp. and the country’s largest banks are among about 30,000 organizations that have signed on to the principles of Cool Biz, according to the Environment Ministry’s Web site. The program is voluntary and no penalties are imposed if the guidelines are not followed.

Kadokura, who now runs the Yokohama-based consultancy BRICs Research Institute, says his estimates are based on research by Shinichi Tanabe, a professor of Architecture and Environmental Engineering at Waseda University in Tokyo. Each degree the temperature is raised above 25 cuts worker productivity by 1.9 percent, according to Tanabe.

“The temperature can easily rise above 28 degrees in areas influenced by heat from office equipment,” Tanabe said in an interview. “The concept of Cool Biz is great but we need a more scientific approach to decide the temperature.”

Cool Biz got its name in 2005 when then Prime Minister Junichiro Koizumi called on his countrymen to dump ties and jackets and dress down in the summer months from June to September to keep cool.

Koizumi set the tone by showing up for work wearing open-neck Okinawan shirts. Lighter clothing isn’t much help to office workers toiling in 28 degrees, said Kozo Hirata, who studies clothing physiology at Kobe Women’s University.

“If you put on clothing and work actively in an office at that temperature, you will probably begin to sweat,” Hirata said in an interview. “Sweating is the last resort to cool down a heated human body. The target is too high.”

To feel comfortable working in temperatures in the upper 20s, people “would have to go naked,” he said. “Wearing shorts and T-shirts might make it bearable, but that hardly fits with Japanese office culture.”

The United Nations last August started its Cool UN energy-saving campaign at its New York headquarters, choosing a temperature target of 25 degrees. That’s lower than the Cool Biz target, even though Tokyo and other Japanese cities have hotter summers than New York.

The average high temperature in Tokyo in August is 31, compared with New York’s 27, according to The Weather Channel’s Web site. Tokyo’s average relative humidity in the month is a tropical 74 percent.

In Nagoya, an office worker at a construction consulting firm said his company requires suits in the office yet keeps the thermostat at 28.

“It’s extremely uncomfortable,” said the man, who would only give his family name, Nakano. “Everyone at my office complains about the situation, but they don’t do anything.”

Sanyo Electric Co., the world’s largest maker of rechargeable batteries, has extended its Cool Biz campaign through October at its headquarters in Osaka, while acknowledging it doesn’t always make sense.

“Sometimes it gets too hot,” Sanyo spokesman Masatsugu Uemura said. “So the temperature may need to be set below 28 in some offices.”

Kadokura said if Japan wants its economy to grow at a time when its population is declining, it needs to boost productivity. A lower birthrate means the population, about 128 million in 2005, could shrink 26 percent by 2050, according to the National Institute of Population and Social Security Research in Tokyo.

The economy is projected to shrink 6 percent this year, the second-biggest decline after Germany among the Group of Seven nations, according to the International Monetary Fund.

“We are behind our goal in cutting emissions, but after Cool Biz, Japanese have become more aware of energy-saving measures,” said Toru Sugiyama, a spokesman for the Environment Ministry. “I don’t think we need to change what we are doing.”

Sugiyama claimed the ministry has never received a complaint from a worker about the heat.

“We aren’t forcing companies to raise or lower the temperature,” he said. “We expect each employer to adjust to the environment in summer by setting up electric fans, changing the office layout or giving workers hand-held fans.”

Kadokura disagrees.

“The small reduction in greenhouse gases doesn’t justify the effect that uncomfortably hot office temperatures have on workers,” he said. “We should focus on raising productivity to boost growth, and Cool Biz seems to go against that.”

In a time of both misinformation and too much information, quality journalism is more crucial than ever.
By subscribing, you can help us get the story right.