Does it face a different direction at night? Just kidding.
How cold is the air blowing out from your registers?
Have you been trained to properly check the freon level in your unit?
Check to be sure there is no vegetation or other items blocking the airflow to your compressor unit. Be sure the coil and fins on your condenser unit are clean and not all bent.
Close drapes and blinds on all south and west facing windows during the daylight hours and limit cooking, clothes drying and dishwasher use to late evening or early morning hours. Even a light bulb left on all day can lead to substantial heat gains inside the home.
When you set your thermostadt to a lower temprature does the condensor unit outside of your home kick on? Does it actually run or does it just hum? The fan inside of the condensor should also be running.