In 2026, a mini split with a SEER2 rating around 20 offers good efficiency...
https://wiki-canyon.win/index.php/Zone_Air_vs_MRCOOL_for_DIY_Install_%E2%80%93_Which_One_Is_Actually_Easier%3F
In 2026, a mini split with a SEER2 rating around 20 offers good efficiency without complicating your electric bill. Look for one that plugs into a standard 115V outlet if you want a DIY install