RS>MR> However, keep in mind that the fan motor controller is already set for a
RS>MR> certain range of temperatures so that changing one setting will likely
RS>MR> affect another. The changes should be very minimal and done one at a
RS>MR> time so their individual effect can be observed more easily. Always
RS>MR> document the initial settings and the changes made with the results.
RS>MR> The overall efficiency has to be re-evaluated as each change is made.
RS>MR> Because there is more air flowing, the air temperature at the grill
RS>MR> should not drop by more than 10'F or be easily noticable in the room.

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

RS> I mean, if you're blowing air out, you're also
RS>sucking air in. My returns are at the ceiling,
RS>so, I figure, it's sucking in the hottest room
RS>air. There must be some "sweet spot".

Robert, you are correct. The best return air inlet location
for heating is at more or less at floor level at the center
of the house so all the room's return air flow can migrate
to the center of the house. Tis just the opposite for A/C,
which is best with the return air inlet at more or less
ceiling height in the center of the house. Not many houses
are set up that way however.

When I added central A/c to my house in Houston, that is
exactly the way I did it. Cut an opening in the hall a\wall
directly above the existing return air and added another at
the ceiling height. For A/C I'd block the lower air input
and for heating I'd block the upper air input. Worked
very well.

Jay

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 þ OLXWin 1.00b þ I'm as confused as a baby in a topless bar.