Only thing green in my house is my plants..lol
We had a heat pump installed, a big difference on our heating and cooling bill. It also helps that our house has 6" of insulation on the exterior walls as well as the floor and ceiling.
My new washer and dryer are alot more energy efficient also. We run a fan on exhaust in the study to pull out the heat from the computers. That way we don't have to run the AC all the time to keep one room cool and the rest of the house freezing.