it's fine equipment, and a quality choice. upgrading for efficiency makes sense up to a point. home insulation and infiltration is key.
I can't stress enough the importance of PROPER air flow, and sizing for the home. proper filter placement and sizing is also very important.
MINIMUM 200 square inches of filter space per ton of cooling. Recommended 350 sqin/ton or more.
The TRUE highest cost system is the system not installed properly...
Do you go to a boat repairman with a sinking boat, and tell him to put in a bigger motor when he tells you to fix the holes?
I am yourmrfixit