Condensation on Window
Condensation on the inside glass surface? This signals a humidity or ventilation problem – we diagnose the cause and recommend the right solution.
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Condensation on glass – where does it come from?
Condensation on the inner glass surface signals moisture or ventilation problems – we diagnose the cause and recommend the right solution.
Inner glass surface condensation is not the same as mist between the panes. This is moisture from room air condensing on cold glass. The cause is either excessive indoor humidity (cooking, laundry, no ventilation) or insufficient air circulation near the window (blinds, furniture right next to the pane).
Another cause is a window with too good insulation and no trickle vent – sealed windows without ventilation always produce condensation. The technician diagnoses the source and recommends the solution: a trickle vent, sash compression adjustment or improved room ventilation.
What causes condensation on window glass?
Surface condensation and condensation between panes are two different problems – the technician will distinguish them
High indoor humidity
The most common cause of condensation on the inside glass surface. Water vapour from cooking, laundry drying and breathing settles on the cold glass. Solution: improve ventilation, install window vents, use a dehumidifier.
Blocked window ventilator
Windows with humidity-controlled or manual trickle vents regulate air exchange. A blocked vent cuts off fresh air and accelerates condensation. Cleaning or replacing the vent restores proper ventilation.
Condensation between the panes – a different problem
If moisture is BETWEEN the panes and cannot be wiped away, this is a failed glazing unit seal – not indoor humidity. This requires glazing unit replacement. The technician will distinguish the two cases during diagnostics.
Condensation on the outer pane in cold weather
A well-insulated low-emissivity outer pane is cold because heat cannot pass through it. External moisture settles on the cold surface. This is not a fault – it is evidence of high window insulation.
How does condensation diagnostics work?
Four steps from wet glass to understanding the cause
Identify location of condensation
The technician checks whether condensation is on the inside surface, outside surface or between the panes. Each location points to a different cause.
Assess ventilation and trickle vents
The technician checks vent condition and room ventilation path. Lack of air exchange is the most common cause of surface condensation.
Repair or replace
Blocked vents: clean or replace. Failed glazing unit: replace. Indoor humidity problem: specific recommendations to reduce moisture load.
Advice and guarantee
The technician discusses preventive measures. All work carried out (vent or glazing unit replacement) is covered by a up to 5-year guarantee.
Identify location of condensation
The technician checks whether condensation is on the inside surface, outside surface or between the panes. Each location points to a different cause.
Assess ventilation and trickle vents
The technician checks vent condition and room ventilation path. Lack of air exchange is the most common cause of surface condensation.
Repair or replace
Blocked vents: clean or replace. Failed glazing unit: replace. Indoor humidity problem: specific recommendations to reduce moisture load.
Advice and guarantee
The technician discusses preventive measures. All work carried out (vent or glazing unit replacement) is covered by a up to 5-year guarantee.
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Our technicians — over 70 years of combined experience with windows and doors
Andrzej
Senior technician and team leader
Coordinates the team and ensures the highest quality of services
Bartosz
Technician-specialist
Ensures your windows and balcony doors operate smoothly
Arkadiusz
Technician-specialist
Ensures your windows and balcony doors operate smoothly
Piotr
Technician-specialist
Ensures your windows and balcony doors operate smoothly
Tomasz
Technician-specialist
Ensures your windows and balcony doors operate smoothly
Łukasz
Technician-specialist
Ensures your windows and balcony doors operate smoothly
Serhii
Technician-specialist
Ensures your windows and balcony doors operate smoothly
Window condensation FAQ
Answers to the questions we get most often
Not necessarily. Condensation on the inside glass surface usually indicates high indoor humidity or a blocked trickle vent – the window itself may be perfectly fine. The technician will assess the cause.
Surface condensation: can be wiped away with a hand or cloth. Condensation between the panes: inside the glazing unit, impossible to wipe. The latter requires glazing unit replacement.
Check the trickle vent – is it open and unblocked? Ventilate the room for 10 minutes in the morning. Avoid drying laundry on radiators. If condensation is heavy, check room ventilation or install trickle vents.
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Replacement of old seals with polyurethane foam that remains stable and does not react to temperature changes, whether in winter or summer.
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