Sorry everyone, I realized in my absentmindedness that I might have written the COP formula backwards during some of my office hours (it is correct in the slides, of course).

COP = Qe/Wcomp, where Qe is the heat addition during the evaporator stage and Wcomp is the work of the compressor (thermodynamic work, NOT electrical work!).

Hopefully people are starting to analyze cycles and looking at COPs to figure out how to get the 'best' cycle from the AC unit.