Some of the following documents may be available as Adobe Acrobat PDFs. Download Adobe Reader.
"Consumer Guide to Home Energy Savings." (2003). American Council for an Energy Efficient Economy. 8th Edition.
Nisson, J. (January 1995). "Energy-Saving Products for Energy-Efficient Homes." Journal of Light Construction (13:4); pp. 31-34.
Hayes, C. (6 June 1994). "Heat Pumps Reflect Customer Needs." Air Conditioning, Heating & Refrigeration News. p. 22.