Is your glass misted up? In the trade we say the unit has 'broken down'.
This means the perimeter edge has lost its integrity and is letting in moisture. It's hard to spot at first, sometimes becoming visible only as the sun or another heat source draws the moisture up. Typically the moisture will be drawn in as the atmospheric pressure changes. This will build up, eventually condensing into water inside the sealed unit.
What can be done about it? The only answer is to replace the double glazed units with new ones. That almost always means little or no disruption to the framework. As the units are designed to be removable and replaceable.
Ask us about Low Energy Efficient Glass. Vista Therm Elite glass is 136% more energy efficient than standard units.
For more information about DWR Glazing & Repair, or to arrange a free estimate, call us today on 07813 125 877