Makes total sense to me. I see this all the time where old rules of thumb get treated like gospel, even when the tech has changed. People just default to the bigger, more expensive option because it feels safer. It's like insisting you need a truck for a job a van could do better. That installer showing the real math is the key. It forces you to actually look at how you live, not just check a box. Good on him for pushing past the standard sales pitch.