how can i keep the second story of my townhouse cool, without down stairs freezing up?

have thermostat downstairs, a/c works great and keeps downstairs cool and comfortable. however, upstairs is way hot.
any ideas - fans just dont cut it!

Answers:
Close some downstairs vents.

Other answers:
Shut your downstairs vents about 1/2 way.
Shut your downstairs vents about 1/2 way.
heat rises as the down stairs cools to 70 degrees anything above that rises,,,,, either by exaust fans or roof vents, you need to get the hot air out of the top floor,,,,it will never be as cool as down stairs because -hot air rises- but you can get it cooler,,,,get the hottest air out thru the ceiling
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