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Electric Fans May Have No Effect in Extreme Heat: Study
Date:7/12/2012

THURSDAY, July 12 (HealthDay News) -- There's no reliable evidence to show whether electric fans keep people cool during extreme heat waves, according to British researchers who reviewed studies on their use.

While some of the studies suggested that indoor fans might reduce heat-related health problems, others suggested that fans might actually make things worse, the researchers found.

They cited health experts in saying: "A fan might help to increase heat loss if the temperature is below [95 degrees] and the fan is not directly aimed at the person, but when temperatures are above [95], the fan might actually contribute to heat gain."

However, none of the studies met the researchers' quality requirements, according to the review published online July 11 in The Cochrane Library.

"Our review does not support or refute the use of electric fans during a heat wave and people making decisions about them should consider the current state of the evidence base. They might also wish to make themselves aware of local policy or guidelines when making a choice about whether or not to use or supply electric fans," review co-author Katie Carmichael, from the Health Protection Agency in the United Kingdom, said in a journal news release.

Another co-author, Mike Clarke, from the All-Ireland Hub for Trials Methodology Research in Queen's University Belfast, stressed that "the evidence is not already out there on the benefits and harms of electric fans. We need a large randomized trial to resolve this long-standing and on-going uncertainty, and to help people make well-informed choices about their use." A randomized trial is one in which study participants are randomly chosen to either receive a treatment or not.

Also commenting on the review, co-author Dr. Saurabh Gupta, a consultant in public health at Hertfordshire Community NHS Trust in the United Kingdom, said: "It is important to know about the potential
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