Economics

Becoming energy efficient is more than just about keeping the environment clean, it's also a huge effect on the economy. The definition of energy efficiency is to use less energy and still get the same services done, so by becoming energy efficient, you reduce the amount of energy consumption.
Reducing the energy consumption means we spend less money on energy and by spending less money, it leaves more money in the pockets of the people. The people can then go out and spend the money they make on other things like food or clothing.
Another way becoming energy efficient does is make jobs. To become energy efficient, we need to get rid of flaws in our energy system, like light bulbs or housing insulation for example. In order to do that, we need to employ people to go out and help solve these problems. Also, it leads to the production of more efficient products making jobs in factories as well.
The last way it effects the US economy is that you can report what you've spent on becoming energy efficient in your tax report to benefit you. According to Judkis from the US News, "You can also take advantage of a number of tax credits for energy-efficient home purchases."
These are just some ways the economy is effected by becoming energy efficient.

Sources

http://energy.gov/science-innovation/energy-efficiency
The website energy.gov is a government website that has a lot of information about how we use our energy and how it impacts us. It's very informative about how we use our energy and gives evidence such as facts and statistics to backup it's statements.It's goal is to inform people how energy is used threw out the USA.

http://eetd.lbl.gov/ee/ee-1.html
This website defines energy efficiency as "using less energy to provide the same service." It also shares information on how people can be energy efficient and gives different examples of things that help become energy efficient. The purpose of this website is to inform people about the benefits of becoming energy efficient.

http://www.greentechmedia.com/articles/read/report-u.s.-energy-efficiency-is-a-bigger-industry-than-energy-supply
This is a website from Greentech Media, and it provides information in articles about green technology. In an article I read, it states that energy efficiency has a greater impact on the economy than energy supply. It gives information based on studies and facts proven. It's goal is to inform people about green technology.