"m Ransley" wrote in message
...
What should the temp rise be on a Ng Lennox Dimension 93% 2 stage
furnace from return to just at the AC coil with new filter, clean
squirrel cage and all ducts open and on low fire of a 2 stage. Mine is
67 in 137 out a 70f rise. Isn`t that to high indicating it is oversized
for the ductwork. I thought 50- 60 was inline. It is a bit oversized and
I am looking at less Btus on a replacement. The Lennox supposedly was
sized correctly as return and supplies were added.

The temp rise information should be listed in/on the furnace somewhere.
Greg