The thermal insulation that double-glazed windows provide can make a difference to your energy bill, but that isn't the only ...

This creates your 'double glazing' on one glass, whilst your other is 'single glazed'. If you've got a heatproof table mat, then put the glasses on these to help avoid heat loss through the table.

This captures not only the U-value of the glass but other factors, such as the quality of the frame, which greatly affects the overall performance. Even double glazing has come a long way in the ...