MR> RS> I wonder if it would be better to monitor the
MR> RS> air temp being taken from the room and comparing
MR> RS> that to the air temp blowing out into the room.

MR>The idea is to compare what energy is going up the chimney with what is
MR>being extracted from the exchanger. Say for example, if there is a lot
MR>more oil burning than is needed to heat up the house, that extra heat
MR>goes up the chimney. However, there are certain limits such as a flue
MR>temperature of at least 400'F minimum otherwise the chimney will corrode
MR>or worse form tarry creosote deposits which as you know are a potential
MR>fire hazard. Also, as was mentioned before, if there is a lot of air
MR>blowing into a room but with a comparatively lower temperature than
MR>before it makes it seem like the room is colder (windchill effect?).

Mike, down here we do not have to worry about creosote build
up, oil burning or the like. We do NOT use OIL or coal - We
use natural gas as does a very large percentage of the USA
now days.

Therefore not many blanket statements as to flues/chimneys
etc. can apply to heating or cooling systems. Wood
burning fireplaces yes, but central heating - no. Even many
of our so called fireplaces have artificial ceramic logs
that are heated by natural gas!

Jay
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 þ OLXWin 1.00b þ I'm not confused, I'm just well mixed.