If you're planning a DIY multi-zone mini split in 2026, Zone Air and MRCOOL...
https://bravo-wiki.win/index.php/Why_Do_Some_%27DIY%27_Mini_Splits_Still_Need_an_HVAC_Tech_to_Charge_Refrigerant%3F
If you're planning a DIY multi-zone mini split in 2026, Zone Air and MRCOOL both offer solid options with thoughtful features