I would move the PC.
Two reasons:
1) The AC may cool the PC or parts of it to the point where condensation may occur. Water and electronics do not mix.
2) Likewise the airflows could do two things: blow dust around that will end up inside the PC, coat components, and cause overheating. Another possibility is interference with the airflows in and out of the PC. Cooling may be diminished.
It appears that there is quite a bit of dust on the AC as is.
Move the PC. While the PC is unplugged open the case, blow out dust and debris, and then reseat all cards, cables, and RAM to ensure that all are fully and firmly seated.
As always, if you are not doing so, be sure to backup all data and ensure that the backups are recoverable and...