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

https://tessatopmaid.com/do-i-need-a-permit-to-install-a-mini-split-myself/

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