Sounds like a ceiling fan or some sort of air circulator is in order. If you put a ceiling fan on blow to push the hot air down it will blend with the air in th

Sounds like a ceiling fan or some sort of air circulator is in order. If you put a ceiling fan on blow to push the hot air down it will blend with the air in the rest of your house and improve the overall comfort of your space. If that won't work, for instance your home is very boxy and separated, it might be worth looking into AC duct boosters on the far away areas to suck more air out of the ducts from farther away. If I misunderstood and you have a ductless system, they make electric fans that go in between paired walls and look like a ducted register, but that are very useful for blending air between two rooms. A few of those alongside a through floor to ceiling below fan duct might be available that could help even out temps in your house even more.