A 3-zone DIY mini split lets you customize heating and cooling for different...

https://cleaningservicesgrandrapidsmi.com/what-btu-mix-should-i-use-for-3-rooms-like-9k-12k-6k/

A 3-zone DIY mini split lets you customize heating and cooling for different rooms without running ducts. With cold-weather models rated to -13°F, you get reliable warmth even in winter