From curtains and blinds, to window films and external awnings, there are many ways you can make your windows energy efficient that don’t involve replacing them with double glazed windows.
Though double glazing can be effective, it can also be very expensive, costing tens of thousands of dollars to upgrade your entire home.
The good news is, a lot of these alternatives are not only affordable, but also have comparable results. See the below graph from Sustainability Victoria.
As you can see, heavy line draped and pelmets can perform even better than double glazing.