To continue my research, Trane's Home Comfort Advisor came over to my house to give me an estimation. Too expensive.
a. 2.5ton, SEER 11.5, Warranty 10yrs compressor/ 10yrs parts
$3028 including tax
b. 2.5ton, SEER 15, Warranty 10yrs/ 10yrs
NON- Freon, new technology, $4087...