Most efficient way to run

Hey everyone, I recently moved into a basement unit that is ~700 ft^2 and it has an elios mini split / heat pump system that im trying to understand how it works.

I have two mini splits (bedroom , living room) and I normally run on at a time, depending on where i am. I have it set to 21.5c and on the follow me mode. I find that in the living room system the temp only gets to like 20 but never reaches the set temp and the only time it turns off is when it goes to DF mode.

I thought normally these things will turn off when it reaches the set temp and then turn back on when it goes down (within a certain temp). I also found then in the bedroom one, it blows room temp air when it reaches set temp. I am mainly worried about how much electricity this is going to use up.

I am not sure if im being paranoid about my living room always running. But I want to know if I am running these as efficiently as I can (or at least properly)

Any help would be great