Thanks, Micky, David.

Finding an older fan might be a solution. It might be hard to test them for an hour or more specifically on a hot day. For the near term, I'm going to try breaking into my fan and lubing it with 3-in-1 oil.

Yes, I've gotten checked out. While I tend to be on the sensitive side, nothing particularly wrong except for a tendency to be bothered by the usual things that others are (dust mites, cat hair, etc.).

The idea of pointing the fan out is good if I want to replace the air the room. For example, to clear it of smoke. But I'm really after the cooling, which requires the breeze.

I am hoping that cleaning and lubing will lead to some relief. However, I have run into a problem. Two of the latches on the front face of the motor appear to be designed specifically to prevent the disassembly of the housing. I posted a picture at The hooks at 12 o'clock, 10 o'clock, and 2 o'clock can bend and slip through the hole when the face is lifted forward. But the face can't lift forward because the clips at 5 o'clock and 7 o'clock cannot bend. They are blocked by plastic tabs. It makes me wonder how they ever manage to snap the face plate on.

I'm open to suggestions as to how to get past this road block. Thanks in advance.