I have a 30 year old furnace, (replacement is not an option, at this
time) and, for the sake of efficiency, I'm thinking of increasing the
run-on time of its fan. The fan control is a single box, with a dial
scale of "80" to "120". Am I correct in assuming that
the scale is
in degrees Fahrenheit, and that the setting controls both start and
stop points? Aside from motor/blower wear, what other considerations
should be taken into account if I decide to lower the setting? If my
above assumptions are correct, will a setting that is too low prevent
proper heat-up of the heat exchanger?
 
   Ken
 
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