need window a/c for old house with hot upstairs, anyone know of a small one with a vent for cool nights?

Anyone know of small, ~5000-6000 BTU window air conditioners that have a vent lever/switch, which would allow me to bring in outside air when running it in fan mode? I have this on my larger (8-10k?) unit, but I haven't been able to find it on any of the smaller ones listed at Sears or Home Depot. I like to pull in cool outside air overnight when possible.

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