I’ve done a lot of messing around with similar circumstances. My current goto is a quiet blower fan / squirrel cage type. Set on top of a floor register in our bedroom in the upper level. Took a cardboard box, opened the bottom, ducted the output through the top of the box. Leave it running on low all the time once the room starts getting too hot. When the ac runs a lot, seems to draw extra to the room, and it will be the coolest room in the house. When the ac doesn’t run a lot, it circulates enough that it’s the same temp as down stairs. Trying to keep 2 sets of blackout curtains closed as much as we can too. Other setups I’ve tried don’t ever pan out for the milder days
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