1: Don't Pre-Cool:
Your car air conditioning works much better when you are actually driving your vehicle because the faster the engine turns the faster the air compressor runs, which lets the system cool more effectively. If the air in your vehicle is hot and stagnant open just the rear windows for 10-20 seconds. This forces all the hot air out of the cabin. Don't open the front windows as this only moves the heat out of the front of the car.
2: Go Low:
Setting the A/C to lowest possible temperature and adjusting the fan makes the air conditioning more efficient, will dry the air out less and can help you save fuel.
3: Don't Reticulate (With Passengers):
If you are carrying passengers in the rear of your vehicle, turn off reticulation mode. The system pulls air from the front of the cabin and pulls back through the system. Everyone in the front of the vehicle may stay cool and fresh but the air in the back can get warm and stale.
4: Make sure your Filter is clean:
Next time you bring your vehicle into WR Phillips for a service, ask them to check your cabin air filter, as a dirty filter can prevent optimal airflow. These can be a little bit tricky to get at on some vehicles and can be a job best left to a qualified technician.