For 2026, an easy-install mini split with a SEER2 rating around 22 is a solid...

https://shed-wiki.win/index.php/Zone_Air_12,000_BTU_Plug-In_Model_-_Will_It_Heat_in_Winter%3F

For 2026, an easy-install mini split with a SEER2 rating around 22 is a solid choice. Look for models that run on a standard 115V plug-in—no need for a 230V hard-wire if you want simpler setup