Most commonly, they are found in cold climates to serve as a retrofit on existing windows in order to improve their thermal efficiencies. Similarly, storm doors (also called "screen doors") allow similar winter savings with older inefficient doors - and allow a screen for summer ventilation.
Storm windows can be mounted externally or internally; can be made of glass, rigid plastic panels, or flexible plastic sheets; and may be permanently or temporarily mounted. They function similarly to insulated glazing.
- ↑ Home Energy Projects: An Energy Conservation Guide for Do-it-yourselfers. DIANE Publishing. 1996. p. 62. ISBN 078813373X. http://books.google.com/books?id=AcO7_19D8j8C&pg=PA62&dq=%22Storm+windows%22&as_brr=1&ie=ISO-8859-1&sig=OK3wnVFmuiWfCtoMxNUYdDVlgzY#PPA62,M1.
- ↑ Oliver R. Williamson, Sarah Cory Rippey (1906). The Complete Home. Original from the University of California: D. Appleton and company. p. 51. http://books.google.com/books?id=7BJIAAAAIAAJ&pg=PA34&dq=%22Storm+windows%22&as_brr=1&ie=ISO-8859-1#PPA51,M1.
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