by 
The Curious Bag
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<h4 class="dechead">On One Hand: Single Pane Windows Cost Less
Single pane windows are cheaper but allow heat to escape from your home. Even thick single pane windows lose up to double the amount of heat as double pane windows. But if you live in a mild area and your primary concern is installation cost, single pane windows may be better.
On the Other: Double Pane Windows Retain Heat Better
If you do not live in a mild climate, double pane windows are best. The space between the panes contains air or another gas, such as argon. This gas-filled space acts as an insulator that reduces heat loss through the window. Installing double pane windows can save you up to 10 percent on your monthly energy bill.
Bottom Line
Consider your climate when deciding whether to purchase single or double pane windows. Choose single pane windows only if you live in an area that has mild weather all year. Otherwise, choose double pane windows. To further minimize heat loss and maximize energy savings, choose Energy Star qualifying windows with sturdy, well-insulated frames.
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