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!

[Jason D.]

@Andrew Schrader I dont think a bathroom fan moves enough air to make a difference. Before doing that, how is the insulation above the bedrooms? I used to have a tri-level split house and the 3rd level was always 15 degrees hotter than the other levels. My HVAC guy recommended adding insulation and an attic fan to cool the attic space. After doing that, the temp was within 5 degrees.