For 2026, a 115V plug-in mini split with around 22 SEER2 offers a good balance...

https://extra-wiki.win/index.php/Can_I_Install_a_Mini_Split_Without_Handling_Refrigerant_at_All%3F

For 2026, a 115V plug-in mini split with around 22 SEER2 offers a good balance of efficiency and ease of install. It works well in spaces up to 600 sq ft and can be DIY installed without special wiring