Question: how to fix air conditioner not cooling in apartment?
Answer: Clean Your Filter. First, turn off the power to your HVAC unit. ... 
Clean the HVAC Interior. Next, clean out the condenser, evaporator, filters and coil. ... 
Check Your Electrical Wiring. Nearly 85 percent of all HVAC repairs stem from electrical problems. ... 
Check Your Ductwork. ... 
Check for Refrigerant Leaks.