My A/C in my 15 year old car still blows cold air, but weakly.

What is your question?

It cannot keep up on hot summer days in Louisiana, though if I run it on inside air it can almost keep up. I was wondering if a recharge would fix it or if it might indicate a need for another repair or service. I lived in MN and NY for most of my car's first 14 years, so I never needed to have the A/C serviced previously.