"I use a criteria of my own choosing. The conditions are easy to set up and are very quantitative if done exactly."
To do comparisons exact means exact, center duct and an acurate digital thermometer and we can talk round the world. The evap temp is probably 2-8 degrees colder measured at the evap temp sensor than at the center duct (depending how long the AC has run)
All in all in ain't going to get any colder though as you were into cycling.
Bosch Master, ASE Master, L1
33 years MB technician