Attic Ventilation Product Suggestions

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Does anyone know of an attic ventilation product that sit inside a window? I just bought a 3 bed ranch style that has ventilation problems.. Roof sheeting looks like its been damp and previous owner said when the seasons changed water would drip from the ceiling fans. It has a ridge vent but it doesn't appear to be allowing any air movement. The only other thing up there is a long window on the South side. I'm imagining something that would fit kind of like a window a/c unit where I could just open the window, set it up and close the window back down on top of it to hold it in place. Any suggestions? There is an outlet near the window so I'm thinking the ideal product would be a temperature sensing vent fan. It has older asphalt shingles that I'm hoping will last another 3-5 years before I put stone-coated steel on. Thanks!