It's an older Westinghouse window A.C. Besides the temperature control, HI - LOW - OFF and Automatic Fan controls, it has this lever that says Exhaust OPEN - CLOSED. With the front panel removed, I can see it flips open a small door inside the unit.
My question is what is that for, or what does it do? I guessed that it would take some of the indoor air and blow it outside with that lever set to OPEN. I held a cigarette near it with it set both ways and pretty much could not notice much difference. The smoke just scattered around the room from the fan. So what is it for?
To get the most cooling and least energy usage, is it better to leave it open or closed?
One other thing, Does the front panel really serve any purpose other than make it look nice? I found that it seems to feel much cooler with that panel off. Maybe it's not really cooling better, but the air comes out better. That panel seems to restrict the air flow. I'd rather have it look ugly and feel good, than look good and not feel as cool.
This may be common knowledge, but I've either had central air, or no air. This is my first window unit. This has been such an extremely hot summer I finally installed it. It's been sitting in the shed for at least 8 years since it was given to me.