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-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of John Clement
Sent: Wednesday, August 24, 2011 10:30 AM
To: 'Forum for Physics Educators'
Subject: Re: [Phys-l] cooling hints
Running the fan may also decrease cooling efficiency by running air
through
the less insulated ductwork in the attic. If the ducts are below the
ceiling then this would probably not be a problem. But running the fan
for
a few minutes after the AC or heater have turned off may increase
efficiency
slightly by allowing a bit more heating or cooling. Gas furnaces have
fans
that stay on depending on a temperature sensor, but AC generally cuts
off
immediately with the compressor.
I wonder if there is a thermostat that could keep the fan running for a
little bit after the normal cutoff. It should not be a big cost item
because most thermostats are now digital, but I suspect the savings
might be
small. But even a couple of percent would be welcome during the
Houston
high cost summers.
John M. Clement
Houston, TX