Double glazing translates to , SE5 these windows have two panes of glass, E14 as opposed to the
CR0 traditional single pane. A layer of gas, SG16 generally argon,
RH11 or
CR0 air is between the two
SE21 N21 panes and [[
https://www.repairmywindowsanddoors.co.uk/ CR0]] behaves like an insulator.