"Harry K" wrote in message
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On Jun 30, 8:36 pm, "Noon-Air" wrote:
"Harry K" wrote in message

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On Jun 29, 8:56 pm, MNRebecca wrote:

Concerning the electric thermostat that controls my Trane furnace and
air conditioner, if I change my fan switch from "Auto" to "On" (so
that it runs continuously), is it pulling in air from outside or just
circulating the air already in the house? In other words, is running
the fan a good way to cool the house at night when the air temp.
outside is a good 15 degrees cooler than inside?

Thanks.

You already got the 'bad' news that it only circulates house air but..

The good news is that running it 'on' will significantly delay the
start of the AC. Much cheaper to run that fan than the AC. In my
case, when it becomes a bit uncomfortable in the house, putting it
"on" will keep the AC from running for another hour or two if it isn't
too hot outside.

Do a little homework sport, running the fan in summer in "ON" will
actaully
raise the humidity level in your home, and make you more uncomfortable.

:Says another person who "I know what I know and don't confuse me with
:facts!" You might be right about the south (I been there too damn
:many years to ever want to go back), but I am not in the south. It
:works up here.

Do some quantitative testing...run a graph on simular days with simular heat
and RH, plot them with both A/C, and fan only, then come talk to me.

:The humidity level in a house will be about static whether you are
:running that fan or not. The fan does not 'create' humidity.

Actually that is incorrect. The RH in a home is always changing, unless you
never run water, you never sweat, you never cook, you never bathe, you seal
up the commodes, have no house plants, or people or pets living there, then
there is the residual condensate on the evap coils that gets put back in the
air when running the fan only.

:So to your mind, running a fractional horse fan is more expensive than
:running a multihorse compressor....uhuh.

If you have a new, high efficiency system. the cost to operate is
negligible, and the comfort level is much higher. OTOH, if you have a system
that is more than 20 years old, and your just trying to cheap out, then all
bets are off.
Either way, your the one that has to live with it, and *my* home is
comfortable.