Daikin has a range which pulls air from the outside. I'm using it in the room I am in now. Here in Sendai the nights are cold enough that my house is coasting still. Thus the mini split is acting only as a fan and pulling in fresh air. This house is old, 30+ years, so it's nice as a retrofit to improve air quality.

Opening a window would be an obvious alternative but then sound would mix.

The true benefit of mini splits is the hyper competitive market. There is a mini split for all desires and the prices to install are reasonable here in Japan.