Electric fans are the most efficient cooling devices. Fans use far less power than air conditioners (see our recent review of the most efficient portable fan). But in hot and humid weather, air conditioning is a great relief. Cooling an entire house uses a lot of energy — it’s much more efficient to only cool the areas where you are sleeping or working, by using a portable air conditioner. (more…)

These “Vari-Cyclone” ceiling fans from FanWorks are perhaps the most efficient ceiling fans available. The fans utilize what Fanworks calls “Gossamer Wind” blade design technology, which is said to deliver 40% more air flow without any increase in power use. They also run on DC power, which also adds to their efficiency when off-grid power is used.

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The latest issue of Home Power has an article on how to cool your house down using natural systems (also known as passive cooling). This is a concept that is neglected in most modern house design — forcing home owners to use air conditioning throughout the summer.

The article illustrates the basics of passive cooling quite well: how to choose the right windows, using overhangs and catching breezes.

Be Cool by Home Power (PDF File)

These Endless Breeze fans are powerful,
portable, high volume 12 volt fans with a twelve inch blade that operates
at three speeds. Air movement of up to 1000 CMF (cubic feet per minute)
is a major breakthrough in 12 volt portable fans. Standing
only fourteen inches high on retractable legs and less than three inches
thick it travels and stores easily. It weights under five pounds.

Power Consumption:
Low: 1.18 Amps
Medium: 1.62 Amps
High: 2.58 Amps

Available from: Amazon ($60)
or Pplmotorhomes.com ($62.95)