It is January. This is Michigan. Weather.com says it is 15°F here in Ann Arbor. In other words, it's cold outside. So can someone please explain to me why my sister has the patio door open!?!? The thermostat, which my sister has complete control of, reads 71°F, so it's not like it's burning up in here. Still, I feel a very cold winter breeze running along the floor. Maybe she misses the old house?