scorpionleather wrote:

the outside unit largely sets efficency. new outer uits are much
physiically larger

thanks... now, that's what I'd really like to find out. If I use my
existing 10 Seer condenser with a 15 Seer indoor coil, should I expect
to get somewhere closer to 11 Seer, or 14 Seer, or somewhere in-betwen
when I mix & match like this?

A 15-SEER evaporator will have a lot more refrigerant volume compared to
the 10-SEER condenser, that would require a lot more total refrigerant.
That is a volume imbalance between the condenser & evaporator, - an
imbalanced refrigerant system won't operate efficiently.
A balance between the indoor & outdoor units plus the indoor airflow
determine efficient operation.
http://www.udarrell.com/aircondition...l_systems.html
- udarrell

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