Need advice on how my roommate and I should split the time we use the air conditioning
Problem/Goal: How should my roommate and I split the time we use the air conditioning
Context: I sleep around 3 am, wake up at 11 am, and stay in bed until 12 pm because I have an afternoon class. Meanwhile, my roommate is a night-shift VA working from home. She sleeps at 12 pm and wakes up at 8 pm. Since she sleeps at a time that is too hot, I just let her use the AC. She will turn on the AC around 9 am or sometimes 10 am, then turn it off once she wakes up, so the AC runs 10-11 hours a day. However, there are many times when I can't sleep properly because it's still hot, even with my electric fan. I would also wake up early in the morning because I could feel myself sweating. Then one day, our electric bill came, and it cost Php 5500 for just the two of us in a small apartment. Our usual bill is always around 2-4k. So, out of panic, I turned the AC off since it was already 5 pm. 10 minutes later, she got up looking irritated and didn't talk to me for a day, which I understand completely because I just turned the AC off, so I apologized.
Previous Attempts: I told her we should limit AC use and split it properly, because I sometimes can't sleep from the heat even though it's not noon yet. I suggested that she turn it on at 8 am, and I will turn it off at 4 pm, so the AC will only run for 8 hours a day. I'm not sure whether she liked the idea, since she hasn't said anything yet. Do you think this is fair?