In the northern parts of the US, at least, warm weather is still on its way so its not too late to check your A/C. If you're at a new job and you haven't learned where the filters are and who typically does maintenance now's the time to figure that out.
I was putting a filter in a pass-through grate the other day and while I was on a ladder I noticed that the head unit on one of our A/C systems had a door. I opened it up and found this:
Those filters don't look so good. Let's take a vacuum to that.
Ugh. That's just terrible.
Much better! That would explain why the airflow was so rotten. I'll be adding that to my quarterly checklist.
So remember kids, buildings are filthy. The world doesn't like your technology and is actively working to destroy it. Be proactive and practice good computer room hygiene.