They just add airflow, which keeps you cool but not the computer.
The bigger the blades, the more energy-efficient it is. What you
want is to move lots of air very slowly, not a little air very fast,
for energy considerations.
For cooling, I blow air from the basement floor through a flexible
duct onto my computer chair, on the hottest days. The resulting
heating of the basement floor keeps the house warm then through
I threw out the heat pump in 1978, when it became apparent it was
chiefly a sink for repair dollars, and went to fans.
I think it has to be a hobby, though. A woman isn't likely to put
up with it.
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