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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



The one 'hint' given by heating/cooling companies that doesn't pay is
running the furnace fan continuously. While that does equalize the
temperature throughout the house reasonably well, it also
adds a good $20 to
the electrical bill each month.