Yeah. Depending on application and how you want it to turn out. I am using a ducted to run teh whole house.

Strong project base brand can easily sell more cassettes and ducted units than normal single split.

I know. It is just that every one here is not refering the normal house using wall mount as single split wall mounted. So next time we have to go all the way to describe the connectivity? Multi split wall mounted, single split ducted, multi split cassettes?