Actually I've seen a forum where a guy did this for overclocking reasons. He took some kind of large hose and attached it to the output of the air cooler. He cut a hole large enough on the side panel and duct taped it onto the hole. Now, his computer was his AC unit and he was overclocking. I don't remember how long ago that was, but it seemed like multiple other people said they were gonna do it too. It didn't seem like anyone thought it was a bad idea.
Other than that, I think that your case probably sucks...
Ok, you didnt say what brand/model case this is and you didnt say if its still overheating when you've got a load on it. AC in the case wont hurt, but its not really fixing the problem your just masking it.
Seems to me you need to look at.......
1. Better fans to move air through the case
2. A better case that will allow airflow
i have 3 cats and 2 dogs and my comp started overheating. my fans were clean and i took of the side, cranked my fans up to 100% and still no change. then i looked UNDER the cpu fan to the heatsink, yup covered in dander.
Yes, Dmitry is correct - its best to re-assemble the CPU heatsink paying close attention to the thermal compound procedure (described elsewhere on these forums) and then start over.
There is one other point that I shall share with you. My temps went sky high when I installed SETI and had it running. I immediately uninstalled SETI and everything was back to normal. SETI uses a lot of resources.
just saying......at least im not trying to claim a moral high ground....
[/snobby teen tone]
Im not here to slap people around, I simply offered to help!
If you took it the wrong way I cant help that, and if that comes across as claiming a moral high ground I cant help that either. Good luck with your computer!