Maybe they should be directly monitoring the AC if they are so concerned about it. Having temperature sensors are nice, but there are plenty of ways to detect what the AC unit is actually doing. These are all very common BAS control problems.
I would offer that instead of monitoring the reactive egress of the devices purpose, thermal deltas, that one instead monitors the proactive ingress of what it needs to function to produce those thermal deltas, Alternating Current. If the devices native monitoring does not offer taps for voltage and amperage consumption then adding this before each device should be considered, certainly in data centers as some here have direct experience with HVAC failures and remaining on site for days to keep the uptime up. As a typical energy consuming device ages one can derive and relate many reactive events over time from proactive energy monitoring and in doing so one is certain to learn something new.
Edit: the user you were replying to was using AC as an abbreviation for air conditioner, not alternating current.