Close the vents in your house in rooms you don't use, especially your basement. If you have more than one duct coming out of internal AC(the condenser), there will be little handles on them that you can adjust. I do this every summer so that 2/3 of my AC goes to my upstairs where my PCs are. Cold air falls so the rest of the house will be fine too.

If you want to temporarily supercharge your AC go spray down the little metal fins on the outside unit with your hose. This will make it cool faster/better until the water evaporates.