There's an explanation for non-qualified use and in that explanation, it states an example where as long as you first lived in the home as your primary residence, then the rest of the time cannot be non-qualified.
It should be noted that as long as you use the home as your primary residence and then move out and rent it until it is sold there won't be any non-qualified time.
It's only when you move back in after you rent it that creates this issue.
