1. U.S. Energy Information Administration (EIA). Heating and cooling no longer majority of U.S. home energy use. (n.d.). https://www.eia.gov/todayinenergy/detail.php?id=10271. [Accessed 23 November 2016].
2. U.S. Census Bureau. House heating fuel - Occupied housing units. 2015 American Community Survey 1-Year Estimates Northeast. (n.d.). https://factfinder.census.gov/faces/tableservices/jsf/pages/productview.xhtml?pid=ACS_15_1YR_B25040&prodType=table. [Accessed 19 December 2016].
3. U.S. Energy Information Administration. Use of Heating Oil. (n.d.). https://www.eia.gov/energyexplained/index.cfm?page=heating_oil_use [Accessed 23 November 2016].
4. U.S. Census Bureau. House heating fuel - Occupied housing units. 2015 American Community Survey 1-Year Estimates Maine. New Hampshire, New York, Vermont. (n.d.). https://factfinder.census.gov/faces/tableservices/jsf/pages/productview.xhtml?pid=ACS_15_1YR_B25040&prodType=table. [Accessed 19 December 2016].
5. Table 8.1. Average Operating Heat Rate for Selected Energy Sources, 2005 through 2015 (Btu per Kilowatthour);US Energy Information Administration,2016