Way - way back in the deep dark past when dinasours still roamed the earth I was taught a quick and dirty way to tell if a AC unit was working about right.
Measure the temperature of the air getting sucked into the intake, then measure the temp of the supply/output air and look for about a 20 degree difference. If that's what you see then the unit is most likely working OK. It may not have the capacity you need to keep the space at the temperature you want.
I'm assuming this rule of thumb still holds true. Maybe the new refrigerant and compressors have changed though. I was taught this little trick in 1983 LOL.