<prompt> Human: Hello! During this particularly hot summer, my roommates couple purchased a mobile AC unit to put in the living room. I spend 90 of my time at home in my room with the door closed, so I was basically sweating my way through the summer. Still, I offered to pay my share of the electricity for the brief moments of cold air.Turns out they had the unit on more than they had it off throughout the last couple months, and our current bill is 3x more than usual due to the AC.Had I known they would be irresponsible with leaving it on overnight, while theyre not home, etc, I wouldnt have offered to pay. Would it be a dick move to pay for a more reasonable cut of the electricity? Weve never had any problems, so I dont think theyd push back, but I want some opinions in case Im just being selfish.  <response>: I dont think it would be a dick move if you approached it reasonably, however they may get defensive. Just be sure its worth it to you to bring it up. 