I have split units and could not be more satisfied with it.

Some might argue that takes more energy than keeping it at a lower temp consistently

I don't know if it's true honestly, but to prove it, you need a reliable study.

Funny thing is, some people are keeping temperature during summer at 17°C (62.6°F), and heat the house during winter to 25°C (77°F). Pure madness in my opinion.