Will weatherproof windows reduce heating costs?

Yes, weatherproof windows will reduce heating costs substantially, depending on the R-value placed on them by the manufacturer. In general, you will find that heating loss through your windows will be reduced by 20 percent or more when you install weatherproof windows. This is because of the construction of the windows. Not only do they use a non-heat or cold-conductive frame, they are also factory sealed after an inert gas is placed between the panes. Also, the greater the number of panes in the window, the higher the R-value will be and the greater the savings on utility bills.