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Understanding Condensation: A Visible Sign Your T&K Windows are Performing as Designed

With winter upon us, you wake up on a cold morning to find a layer of dew or mist on the outside of your window pane. 

Homeowners like you often worry that this moisture means their new windows are leaking or are faulty. Fear not, this is actually a powerful visual indicator that your double glazing is working perfectly. 

This article will explain the simple science behind external condensation and why it is a sign that your T&K windows are saving you money. 

The Science Made Simple: Why the Outer Pane Gets Cold

Condensation happens when warm, moist air meets the cold surface also known as the dew point. 

High performance windows, like those sold here at T&K, are designed to create an exceptional thermal break between the outer pane and inner pane. The internal air is kept warm by the highly efficient inner pane so no warmth reaches the outer pane.

This results in the external pane of glass remaining very cold, allowing the naturally warm, moisture rich outdoor air to condense overnight.

what is external condensation

The Difference Between Old Windows & New Windows

Old, single pane or poorly double glazed windows leak your home’s heat outside. This makes the outer pane warmer and prevents external condensation, but also makes the inner pane cold, leading to condensation on the inside of your home. 

T&K windows flip the script, they keep the heat in and the outer surface is allowed to follow the outside temperature, leading to a dew point on the exterior. 

This is most common in both spring and autumn, when the air temperature changes rapidly, but your home remains relatively warm.

T&K’s Commitment to Thermal Excellence

Here at T&K, our high quality windows come with the option of double or triple glazing. With this glazing, inert gas such as Argon provides superior insulation keeping heat inside your home and the coldness outside.

Our windows also feature low emissivity glass and the microscopic coatings reflect heat back into your space.

External condensation is the visual evidence that our window premium features are effectively blocking heat transfer and reducing your energy bills.

When Condensation Is a Problem

When it comes to internal condensation, this is the only time you need to worry. If you see moisture between the two panes of glass, or on the interior surface of the inner pane, this is a sign of excessive indoor humidity or a failed window.

We recommend ventilation strategies as a solution to this if replacing your windows is not possible. Opening your window for a few minutes or turning on an extractor fan is a good short term solution.

When you choose windows from us here at T&K, you can have peace of mind that we stand behind our quality and guarantees against seal failure. 

A Clear Sign of a Smart Investment

External condensation is a compliment to your window’s energy efficiency and also a sign that your home is well insulated.

Upgrade your old, inefficient windows with T&K Home Improvements and stop worrying about morning dew. 

Start seeing condensation in the right place and contact us today for more information. 

Alternatively, get your free, online quote and begin your journey to new, high performance double glazed windows. 


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© 2025 T&K Home Improvements | Registered No. 02172185 | VAT Number: 576468196 - Registered in England and Wales – FRN 794188

T&K Home Improvements Limited of 2-6 Huxley Close, Park Farm South, Wellingborough, NN8 6AB act as a credit broker and not the lender. Credit is provided by Novuna Personal Finance, a division authorised and regulated by the Financial Conduct Authority. Credit is subject to application and status. Terms & conditions apply.