Air conditioning 101:

1. Use the correct size unit for the room(s).

2. Make sure you have sufficient attic insulation and that your attic is adequately ventilated. 

3.  Keep windows and doors closed and latched.

4. Check weather stripping on exterior doors. 

5. Lower blinds, shades and drapes.

6. Run fan for extra circulation. Ceiling fan should be set to turn counterclockwise in warm months.

7. Replace air filter when it gets dirty. 

8. Use a dehumidifier in your basement or lowest level. 

9. Turn off all unnecessary heat-generating appliances including computers and run heat-generating appliances during cooler hours.   

10. Replace incandescent bulbs with CFLS or LEDs.