The glass combination is low iron glass, soft coat, argon gas and warm edge spacer. As you can see there is condensation (moisture) appearing on the outer pane of glass, which has started appearing on cold mornings, and clears up within a couple of hours.

The windows previously did not get any moisture appearing externally, when Low E glass was installed.

It says to me that the units are working so effectively that warm air from the inside of a house, is not getting to the outer pane. In other words, the windows are performing extremely well at cutting out heat loss.

But, how does an installation company deal with customers who find this ‘feature’ unacceptable?

On a positive note, the householder has noticed a noticeable difference to the temperature of the home, and a massive difference to the amount of natural light in their rooms.