"Top 10 things consumers should know about air conditioning"

If you're having A/C trouble during the current heat wave, ASHRAE has a good list that can help you figure things out:

1. How an air conditioner works

2. What a "ton" of cooling is

3. What goes wrong

4. What those filters do

5. Maintain the system

6. Ducts matter -- a lot

7. How to increase energy efficiency

8. Lighten your load

9. Ventilate

10. It's not the heat, it's the humidity