And the second.
Secondary glazing improves the thermal insulation performance of your original windows whilst not detracting from their appearance. This is useful in period homes where you don’t want to replace perfectly good and extremely characterful windows with brand new double-glazing.
Secondary glazing is also an excellent sound proofer. Noise from outside, particularly traffic noise has been greatly reduced. Apparently the bigger the gap between the two panes of glass the greater the noise reduction, so these are actually better at noise insulation than double-glazing.
There were old secondary glazing panels here when we moved in but they were poorly fitted, had large timber frames and the glass was not the required safety-glass.
I chose aluminium framed secondary glazing with hinges and clips. This will allow access for cleaning and also possibly future repairs to the fragile Edwardian leadlight glass.
As soon as they were fitted we noticed how much warmer the house felt on the stairs and landings and even the rooms off the halls. I have turned the heating thermostat down a little and it’s still toasty warm. We will be very glad of this during January.