A 3-zone DIY mini split lets you control the temperature in multiple rooms...

https://list-wiki.win/index.php/Do_Multi-Zone_Mini_Splits_Need_One_Outdoor_Unit_Sized_for_Total_BTU%3F

A 3-zone DIY mini split lets you control the temperature in multiple rooms without rewiring your whole house. Many systems are efficient down to -13°F and boast SEER2 ratings around 24, keeping your energy bills low