For a straightforward 2026 install, look for a mini split with a SEER2 rating...

https://web-wiki.win/index.php/Pioneer_Quantum_Hyperformance_vs_Standard_Pioneer:_What%27s_the_Difference_for_Cold_Weather%3F

For a straightforward 2026 install, look for a mini split with a SEER2 rating around 20 for good efficiency. Choose a model that runs on a 115V plug-in to avoid complex electrical work