Damn right, AC is non availability is not an option where I am.(f)(l)(a)(Sounds like the compressor clutch may be sticking but that's only a guess. Since you live somewhere hot and sticky (no pun intended), I would take it in and have it checked.
In my experience the problem with these type of issues is they only get worse over time and when it inevitably fails... it will be somewhere inconvenient and be even more expensive.
One last thought is whether you plan on keeping the car or not. If you do, get it fixed, if not, I would still consider fixing it as anyone else buying it will offer you considerably less if isn't working right.
Good luck, hope this helps...