An airconditioning system should provide an indoor environment of
approx. 15-20 f lower than the outside temperature at the time 'if' it
is properly sized and functioning correctly. The last poster gave you
a very good way to check the systems effectiveness . Do that, and let us
know. Keep in mind, that, if you have alot of heat generating equipment
in your apartment, then you may have increased the cooling load beyond
what the system is capable of .