Do I need triple glazing?

The short answer is yes. You would probably be surprised by the total area of glazing on your low-energy building, which can be quite large especially if you have lovely views. If you compare the thermal efficiency of the walls to the glazing you will realise that the walls are around four times more efficient than triple glazing, or six to seven times more efficient than double glazing. This equates to a lot of heat loss, which in turn equals a lot of additional CO2 emissions and energy costs. Triple glazing will also provide better acoustics and thermal comfort than double glazing. The inside pane of glass will not be cold to the touch, meaning you will be able to sit next to a large window on a cold day but not feel cold.