Hot upstairs bedrooms - bathroom fan to attic?

[Andrew S.]

Hey BP! 

I recently moved into my first house hack that I gutted and finished up to move-in with my old roommates.  They've complained about the upstairs bedrooms being hot and minimal air flow.  I currently have a storm window with no screens on the old wood sash windows.  Could I install a bathroom vent fan in the ceiling of the upstairs bedrooms to create air flow from downstairs to keep it cool?  I would think this would work? 

I have good attic access above the bedrooms. Since it won't be in the bedroom dealing with moisture - would I need to vent it outside or would venting it to the attic space or right underneath the roof vent be sufficient?

Thanks!