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Make sure the contractor is accredited by associations such as the International Ground Source Heat Pump Association.
FORBES: Magazine Article
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It works by using a power source to pump 10 kV of juice to an electrode, which then polarizes a dielectric plate, causing it to attract your body hair.
ENGADGET: Chilly Chair uses static electricity to raise your arm hair, force an 'emotional reaction' (hands-on video)
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"I know they're being overpriced because everybody thinks they're magic, and they're selling it as magic, " says James Bose, a professor at Oklahoma State University and executive director of the International Ground Source Heat Pump Association.
FORBES: Underground Cash
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So she is now working out how to pump them electrically, using a tiny source of electrons that would also fit on a chip.
ECONOMIST: Microlasers
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Firstly, the Internet, which five years ago was a mere bud, has blossomed into a huge source of ready-made content to pump into people's houses.
ECONOMIST: Television and the Internet
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To put that figure in context, Iannelli says that the energy required to pump freshwater from underground (which, he says, is the most common source of drinking water in the West) typically produces just over 1.5 tonnes of CO2 per million gallons.
CNN: Counting the carbon cost of bringing water to the desert