For more information on topics discussed in Lesson 10, see these selected references:
Links
[1] http://www.eere.energy.gov/buildings/info/homes/buyingwindows.html
[2] http://windows.lbl.gov/pub/selectingwindows/window.pdf
[3] http://www.energystar.gov/index.cfm?c=windows_doors.pr_tips_windows
[4] http://www.nfrc.org/
[5] http://www.energystar.gov/index.cfm?c=windows_doors.pr_anat_window#glazings
[6] http://eetd.lbl.gov/success/window.html
[7] http://hem.dis.anl.gov/eehem/95/950708.html
[8] http://www.efficientwindows.org