We recently installed balcony skylights in our western-facing, semi-finished attic "bonus room". Part of the ceiling was cut away and LVL beams were instaled at the hips and joining rafters to create a 12' vaulted ceiling. Despite blackout shades in the windows and a mini-split, it was unsurprisingly 95° in the summer prior to any insulation.
The area where the ceiling is still intact will be walled off and an inline vent fan with an intake will be installed at the peak to draw the ambient hot air to the outside (the red circle in the photo). Baffles were installed between the rafters. There is spaced sheathing that allows air flow laterally across the walls/roof. Styrofoam sheet insulation is going in the rafter bays.
The plan is to put interior intake vents in the bottom corners to draw in cool air from the room, through the baffles, and exhaust it into the room at the top. The expectation is that the nearby exhaust vent will draw the hot air outside. We'd plug the vents in the winter.
Is this reasonable? We're concerned that venting at the peak back into the room will just fill it with super-heated air, leaving it hotter than if wed just tried to button up all the walls and prevent any air flow. The fan is thermostat triggered and is reasoably powerful but didn't do much during construction when there were no walls or insulation.
The walls will be constructed with the same tongue and groove visible in the photo so some gaps between the roof and walls will be inevitable. We are also planning a thermal curtain for the skylights in the hot summer months (Portland, Oregon).
To vent or not to vent? Or something else entirely? Thanks for any guidance.