I have a room with 6 windows and a storm door. It was originally a "sun room" and now working from home, I have converted it into an office. I have 2 computers and 4 monitors so I know that adds to the heat in the room. It is routinely 5+ degrees warmer than the other rooms on our first floor.
We have blinds and blackout curtains on all windows and we keep them closed during the hot Eastern NC summer. We have a ceiling fan and an oscillating fan in the room as well. There are 2 vents connected to the main HVAC unit. The thermostat for that unit is in our den area and that area remains a comfortable 71 degrees F. We prefer not to go with a window unit AC or fan unit if possible.