My upstairs neighbor runs their AC in the winter, and it annoys me.

An AC running in the summer is understandable and normal, but it's already getting down to 50F at night and my upstairs neighbor is still running their AC. I know they have a right to do whatever they want, but from a logical standpoint it just bugs me because they're the only one in the complex running their AC. And given it's the only one running, the noise is annoying. I just needed to vent. Thanks for listening.