On Wednesday, January 27, 2016 at 5:37:33 PM UTC-5, BQ340 wrote:
There's some truth to that. The issue though is what effect
the small rise in heat exchanger temp has versus the effect of
not heating two whole rooms. My bet is the change in efficiency
by the increase in operating temp is small compared to savings
from closing off the rooms. And we don't even know that any
given installation is even at the max temp rise spec for the
furnace to begin with. AFAIK, as long as you're within the
max permitted temp rise, the furnace meets the stated operating
efficiency on the label.
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