For 2026, a 20 SEER2 mini split with a 115V plug-in option is a solid choice...

https://ace-wiki.win/index.php/Is_a_9K_or_12K_Plug-In_Mini_Split_Enough_for_a_Small_Apartment%3F

For 2026, a 20 SEER2 mini split with a 115V plug-in option is a solid choice for easy DIY installation. These units cool efficiently down to 5°F, perfect for mild climates