I voted for extra chores.
Sometimes they don't even want to use the phone, so that won't always work. And its hard to take tv away when others in the house might be watching it, they would have to stay in their rooms to avoid watching something. Total grounding is overkill, specially as the parent is supposed to be the one making sure their kids do what they are supposed to.
Granted you are trying to teach them responsibility, but they are still kids, and learning. If they were totally responsible for all their actions, they would be adults. Cause we all know parents/adults never oversleep or make mistakes...yeah right.
Oh and on the window issue, I don't know, my teenagers always have their windows open, claiming they are hot at night (and I know my kids aren't smoking anything). We don't have thermostats in each room though. Could be that running around getting ready, blow dryers, changing clothes, etc makes them too hot and they don't think to turn the therm. down? Opening one window won't take the smell of anything away unless there is a hurricane going on outside and blowing in the window. You would know something was up the minute you walked in the room.