Heat losses through windows in buildings are substantial. What percent reduction in heat loss would be mitigated by remplacing a window contaning a single pane of glass with ( a) double pane low E insulating glass or (b) a 3- inch thick sheet of expanded polysterene sheet? the quoted R values for theses items are :
- single pane of glass -0.90 ft^2 hr F/Btu
-double pane of low E insulating glass -2.3 ft^2 F/Btu
-1 inch sheet of polystyrene sheet-4.0 ft^2 hr F/Btu