“Windows technology has changed dramatically in the last 15 to 250 years allowing much greater energy efficiency both in the construction of frames and in glazing and coatings.”

The article describes energy considerations and types of windows by material (wood, vinyl and PVC, metal, and fiberglass)

“Let the Sunshine in-Keep the Weather Out.” CCCA InSite Magazine. August/September 2015. by Troy Griepentrog. pp 52-53. Available electronically to members. http://www.ccca.org/public/publications/insite.asp