Standard double glazing
The standard double glazing is the cheapest option in double glazing. It reduces the heat loss compared to single glazing by 55%.
Low E and argon glass
This glass option is the recommended glass option, as the U-value of the glass is approximately the U-value of the Eurotech WinDoors® timber frame. Windows with low E (low emissivity) film have a thin, transparent low E film suspended between two panes of glass in order to reflect heat energy back into the room. By adding argon gas, the glass is significantly better at reflecting heat back inside.