How to make sure you’re buying an energy efficient window
Even though windows all look the same they don’t all perform the same – but it’s easy to compare them by looking at independently verified scores.
Here’s what to look for:
Windows that keep the heat in (Low U Value)
Windows that take the heat from the sun (High G Value)
Windows that don’t let the heat out (Low L Value)
Windows with a A++ WER rating (All of the above in one simple number)