Mom tries to explain why her electric bill is higher

This morning I told Mom their one bedroom electric bill was twice as much as the one for Mik and I's two bedroom.  She immediately came backs with, there's two of us living here. Um, yeah, there's two of us living in our place, too, and we're actually both home way more. The real difference is they keep the thermostat at 73 and we haven't even turned ours on since she moved to their place beginning of August.