In my experience, heating and cooling is the bulk of residential energy use. If you live in an older home, make sure to get an energy audit from the utility com

In my experience, heating and cooling is the bulk of residential energy use. If you live in an older home, make sure to get an energy audit from the utility company (usually free - maybe you just need some additional insulation. Also, thermal curtains (aka, black-out curtains) can help if you have a lot of window surface area.