Cost table for Appliances energy right:
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Energy Cost

Air Conditioner - Central Unit

Typical Energy Input   Approximate Cost for Normal Use
Efficiency Rating (SEER)
7.0   13½¢ per ton per hour
9.0   10½¢ per ton per hour
10.0   9½¢ per ton per hour
11.0   8½¢ per ton per hour
12.0   7¾¢ per ton per hour
13.0   7¼¢ per ton per hour
14.0   6¾¢ per ton per hour

Air Conditioner - Room Unit

Capacity (Btu/hr)   Efficiency
Rating (EER)		   Cost
6,000   (½ Ton)   7.0    857 Watts   6¾¢ per hour
    8.5    706 Watts   5½¢ per hour
    10.0    600 Watts   4¾¢ per hour
9,000     (¾ Ton)   7.0    1286 Watts   10¢ per hour
    8.5    1059 Watts   8¼¢ per hour
    10.0    900 Watts   7¢ per hour
    11.0    818 Watts   6½¢ per hour
    12.0    750 Watts   5¾¢ per hour
12,000   (1 Ton)   7.0    1714 Watts   13½¢ per hour
    8.5    1412 Watts   11¢ per hour
    10.0    1200 Watts   9½¢ per hour
18,000  (1½ Ton)   7.0    2571 Watts   20¼¢ per hour
    8.5    2118 Watts   16½¢ per hour
    10.0    1800 Watts   14¢ per hour
24,000  (2 Ton)   7.0    3429 Watts   26¾¢ per hour
    8.5    2824 Watts   22¢ per hour
    10.0    2400 Watts   18¾¢ per hour