How do you attain nouns conditioning to flow upstairs with the sole purpose? I currently have one A/C unit outside and it runs for the...

I currently have one A/C unit outside and it runs for the entire two story house. Downstairs is already cool but upstairs is hot and I would close to the A/C unit to focus on getting upstairs cool only to conserve power because we are from time to time downstairs and it doesn't get as hot as it does upstairs. Can this be done? What will I need to do to bring this done and at what cost? Is there a installation term that I can ask for when shopping for an A/C repair guy. Thanks.
If you have to choose, Would you prefer...
Answers:    I would a short time ago get one of those turbo fans from Home Depot and plug it contained by down stairs to shoot the cooler air up, Also I would close some vents downstairs to put more nouns flow upstairs.
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You should have grilled vents that widen and close.this will help alot...won't do it all..hot nouns rise's soooooooo nite
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get a window ac for upstairs.hot nouns rises thats why its hot up there .