On Jul 22, 12:54*pm, wrote:
On Wed, 22 Jul 2009 10:00:41 -0700 (PDT), JIMMIE

wrote:
I doubt if any improvement in the compressor driven
section could signifiantly improve overall efficency of the system.

That is not true at all. Old systems had a SEER in the 6-8 range. New
systems are 18 or more.
The biggest improvement usually comes with the new duct work and
getting that air handler out of the attic.

Going from 6- 18 seer might save you 75% in operating costs im guessing