If you live with single glazed aluminium framed windows, you might find drafty in the winter and sweltering in the summer. You can either crank the heat or pump the AC. Neither bodes well for environment, or your utilities bill. So what are your options?
Replace your old windows with new high performance windows . At the very least you'll want to use gas filled, double glazed windows with a Low-E coating. The gas fills the space between the two window panes preventing heat loss, while the Low-E coating keeps the warm air in during the winter months, and cool air in during the summer months.
If you don't have the option of new windows, there are alternatives to saving the energy lost through old in-effecient windows.
Buy a Low-E coating film you can apply yourself. Make sure you buy the invisible kind, rather than tinted kind.
Caulk your windows, and place new weather stripping around your doors. Those gaps around your windows and doors let out a ton of heat, by filling the gaps you can cut your loss by 50%
Pull the shades! In the winter months, during the day, leave curtains open and blinds up. This way the sun can warm your space naturally. As the sun sets, trap the heat in by closing your curtains and dropping your shades. Double lined curtains and cel shades make for great window insulators.

Cool Window : Catherine Normandeau
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