I have about sixty-five split systems in two apartment buildings using R-410a. The factor that is keeping me from meeting this credit's requirements seems to be Rc (lb/ton). Since these are small systems, their Rc runs from 1.9 to 3.5, but most are about 2.8. It looks like that makes compliance impossible.

Has anybody, anywhere, ever made this credit with small split systems? Or am I just done for?