It's 90 deg. outside, humidity is 37%. The A/C is set to 80 deg. The
temp in the apartment is at 83 deg, and hasn't gone below that. The A/
C has been running non-stop for hours. The temp out of the vents is
colder than the air in the apartment, but not a lot colder. (I don't
have a thermometer.)

Maintenance fixed the A/C only a month ago when it completely quit
working. Our electric bill that month was $320 for a 800 sq ft
apartment.

Maintenance is coming tomorrow. How do I make sure they fix the unit
right, or make the landlord replace it if it won't work properly? The
electric bill is outragous.

The unit doesn't show a manufacturing date, and I can't find the model
no. on the manufacturer's website. Here's what the stickers say:
Goodman Manufacturing Co, 1501 Seamist Dr,
Houston, TX 77008
Model No. AW30-05C
Part No. 20203-23
Regrig 22
Design PSIG 150
Heater Amps 208/240V
Motor 1PH 60HZ 3.5 Amps 1/3 HP
Single Circuit 17.3/20.0
Min Circuit Ampicity 26/29
Max Overcurrent Protection 30/30
UL Listed - G0587770080

Also, once the unit works properly, how much more does it cost to keep
the apartment at 76 as opposed to 80 (above conditions)?

Thanks