My roommates didn't seem to be very happy about switching to the boiler that needs to be turned on every time for the first two days, but I talked to them yesterday, and I think they understood the good cause. That was good.
Also, I am gradually giving up on the habit of turning on the kitchen and bathroom fans. And I am getting used to turning off the living room light every time I leave. (That includes getting used to the super dark living room at night when I go to the bathroom. = u =)
I know these are just really tiny baby steps, but hopefully, it will still make a little difference to the world we live in. May God help me to do more than this.