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Posted by Andy Energy on July 2, 2008, 1:43 am
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> > 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. =A0Much cheaper to run that fan than the AC. =A0In 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 actaull=
> raise the humidity level in your home, and make you more uncomfortable.
This can be correct; the typical house in the US has 30% duct
leakage. The ones I=92ve measured normally are much higher. So if the
return is outside the thermal envelope (only testing can determine
this and not visual) and it leaks (guaranteed unless the ducts have
been sealed very well) or the supply ducts leak (also guaranteed)
running the fan will pull air from the outside into your house. Or
the closing of interior doors will make rooms go positive in pressure
forcing air to the outside and the space with the return will go
negative again this will increase infiltration/ exfiltration.
Andy
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> comfortable? =A0It works for me and I prefer the comfort given with the
> fan to listening to the AC give the same comfort at additional cost.
> Harry K
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Harry, let me ask you a technical question.....
> How much dick do you suck in an average day?
> a) 1-3
> b) 3-5
> c) I need to have cum gutters installed on my chin.