11/09/2026
It’s that time of year again!
This is a picture of our windows this morning, which many people who have had their windows replaced may also see. We often get calls from customers who have never seen this on their previous windows so we have put an explanation below.
Why do you see external condensation on high performance windows?
In certain weather - usually in Autumn and Spring - when cold mornings/evenings combine with high levels of humidity in the air you may find that your windows have condensation on the outside. This is because the outside pane is colder due to heat being retained inside your home ie. your windows are performing well! The water particles in the humid air then condensate on the glass.
This condensation doesn’t usually last long - it will disappear as the temperature/humidity changes ☺️
