> >> Basically, the thermostat controls the burner and the limit switches
> >> control the blower based on the internal temperature. You want about
> >> 90dF low and 110 high. It lets the burner pre-heat so you don't get
> >> a cold blast, and runs the fan after the burner has shut off so you
> >> don't waste heat up the chimney.
> >
> > I've not checked it with a thermometer, but feeling the air from a
> > register seems to confirm that the fan switch is pretty close.
>
> Am I missing something?
>
> My fan timing is controlled by my thermostat, as in "the digital control
> thing that lives upstairs". Lots of settings in it to compensate for
> various furnace types and personal preferences.
>
> Considering this thing cost $40 at most, dealing with a mechanical one
> that may be inaccurate seems odd...
Ummmm, yes you are missing something - read the first sentence. They're
talking about the limit switches in the furnace itself.
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