translation.en: And at less than a five-year payback, all of a sudden this becomes very economic So you don't have to just want to have a feel-good attitude about energy to want to have one of these.
translation.zh: 如果5年内能够取得回报，所有的一切将变得非常的经济。 你将不只基于关心能源问题 而想购置这么一个设备。