Insulation

One of the best ways to help make your house more energy efficient is to re-insulate. It can have a slightly heavy start up cost, but the pay off is defiantly worth it. By re-insulating your home, your heater/AC unit do not have to switch on as much. (You can also turn your thermostat down a few degrees, quick, free, and will save you a little money every month.) Cellulose is the most eco-friendly insulation you can purchase, but does increase start up cost a bit. Cellulose is recycled newspaper treated to be fire resistant. Here is a website explaining the other options concerning insulation
For help preparing an attic for cellulose-
For help installing fiberglass insulation-
　http://www.diynetwork.com/how-to/how-to-install-fiberglass-insulation/index.htmlhttp://www.diynetwork.com/how-to/how-to-install-blown-in-cellulose-insulation/index.htmlhttp://www.energysavers.gov/your_home/insulation_airsealing/index.cfm/mytopic=11510