I annoy the whole family for telling them to turn the friggin lights out all the time even if they plan on coming back in the room "soon" as soon tends to be between 10 to 60 minutes.
Same goes with my mother-in-law's ex-boyfriend who never turned a stereo off, just turned it down so you can't hear it...
I have a lot of devices on "master-slave" (not sure if that is allowed to say anymore...) so say if you want to use the Blu-ray player, record player or cassette you have to turn the receiver on first. Otherwise they are completely off.
I also have my computer (laptop), monitor and other things on a power strip I turn off when I leave the desk. The computer is of course still on...
I also have our heating adjusted to mostly only heat when we are home. Yes I know it takes more energy to get things up to temp but our schedule is pretty predictable so I if we are out for more than hour I count on the insulation to keep things going.
I also don't heat tap water constantly as we have solar heating for that. Even cloudy days will keep it at around 40Β°C. The furnace kicks in twice a day to kill off any baddies that may have decided to try to form.
We use about half the oil our neighbors do and we have 2 teenagers!