What causes condensation on the outside of new windows?

One of the many reasons we replace the windows and doors in our home is for better energy efficiency.  Whether multi-chambered PVCu windows or thermally broken aluminium with polyamide materials, modern aluminium windows and doors are designed to be as energy efficient as possible.  At times you may see condensation on the outside of your new windows and doors.  What causes condensation on the outside of new windows and why does it happen?

condensation on the outside of new windows

Understanding condensation on the outside of double glazed windows.

Whether made from aluminium or PVCU, both types of modern replacement windows feature a frame design and materials that provide insulation for the entire window and prevent the cold from the outside transferring to the inside.  They also prevent the heat inside your home from escaping to the outside.

As well as advanced frames, the glass we use is also latest generation and specification working together with your window frames.  Our table explains the key differences between old and new windows and doors to help explain why you get condensation on the outside of new windows.

Old Windows and DoorsModern Windows and Doors
Single glass.Advanced Double or Triple Glazing.
No thermal insulation to the window frames.Multi-chamber PVCu or thermally insulated aluminium.
Basic double glazing with basic sealant and metal spacer bars.Warm-edge spacer bars and advanced seals.
No coatings to the glass.Sophisticated low-emissivity coatings.
Air space between the glass.Argon gas fill.
Do not meet current Building Regulation energy efficiency requirements.Meet or exceed current Building Regulations energy efficiency requirements.
Do not retain heat in the home.Retain more heat in the home.
Cold from the outside passes through the windows.Cold is prevented from passing through the windows.
More cold surfaces.Minimal cold surfaces.
Basic window seals.Advanced rubbers, woolpile or Q-Lon
Cold Spots on the inside of the home.Cold spots kept on the outside of the home.
Condensation on the inside of an inefficient window.Possible condensation on the outside of a modern window.
Basic fixing methods used.Modern fixing methods employed.

Therefore if we have replaced your old, inefficient and single glazed windows, or even those with first generation double glazing, your new windows are more advanced and better made than ever before.  All these features of your new windows make them highly energy efficient.

Condensation on the outside of new windows is normal.

Condensation on the outside of new windows does not mean they are faulty. It is simply the windows doing their job of keeping your home more energy efficient.

During the Autumnal and Winter months the phenomenon of condensation on the outside of your new windows and doors will be more frequent. Where previously the heat was escaping and the cold was entering your home, your advanced windows and doors are so good, the heat is staying in your home and the cold is being prevented from entering it.  The outside of your window is now colder than the glass or the window it replaced.

A great example is defrosting a frozen windscreen on a cold morning.  Your car heating is warming up the windscreen from the inside, the heat is passing through and defrosting it on the ouside.  An energy efficient window prevents the transfer of heat.

Helping you understand external and internal condensation.

Internal condensation is usually caused by how we live in our homes and the amount of moisture we create from cooking, heating, drying clothes inside and not ventilating our homes enough.  Often this is the cause of internal condensation and not just on windows and doors.

External condensation is the opposite, with moisture remaining on the outside and landing on the first cold spot it finds, in this case the outside of your windows.

Finally, if you see condensation between your panes of glass this means the sealed unit has failed and will need replacing.  This is common on very old double glazed windows.

Condensation on the outside of new windows means great performing windows.

Why not visit our showroom and let us show you all the features of our advanced windows and doors such as the glass spacer bars, frame insulation and glass coatings? This will help you understand  why condensation on the outside of new windows is normal.

Any condensation on the outside of your windows and doors will disappear as soon as the outside temperature starts to rise.  Your new energy-efficient windows are keeping your home warmer, more comfortable and more secure than ever before.

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Roy H.
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From the first phone call, a visit to the showroom, through to the site survey and installation, the Aspire team have been unfailingly both very professional, problem solving and friendly. They delivered a great product and service, at a good price, on time, with flexibility, diligence and a smile, and that in our experience is almost unheard of these days.We will definitely turn to Aspire again when we next need windows etc, and can't recommend them enough.
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Aspire did the most beautiful job in our house. The installed our windows a few months ago, and I couldn't be happier.They were always happy to answer to our question.They came at 8 o'clock and installed the windows very swiftly with a very clean and tidy result. They decorated afterwards around the windows and you couldn't tell those weren't the original windows as the result was so good.We have a toddler in of the rooms they were installing the windows and they accommodated their work around his naps which was brilliant.If you are looking for anything window or door related look no further, I will definitely recommend and if needed use them again.
GEMMA M.
GEMMA M.
10:20 28 Apr 21
Aspire supplied the most beautiful 7m sliding doors for my extension. The doors are great quality and all the fitting and snagging very professionally handled. Would not hesitate to use this company. Thank you.
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15:33 16 Mar 21
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19:06 06 Jan 21
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16:01 04 Jan 21
We were recomended to Aspire by our carpenter who was building a garden room for us, and we were not dissapointed.From the initial meeting to the completion of the work the company , and especially John Small, and the lads that came to install the doors on one of the wettest days of the year, have been excellent.The Bifolds are amazing. They look so good, and when they open and close they sound solid and beautifully made.Superb job. Thank you.
Simon B.
Simon B.
08:12 25 Nov 20
I don't usually write reviews but Aspire have been an absolute pleasure to deal with from start to finish. After replacing my neighbours sliding doors they came highly recommended. The lady on the phone was extremely helpful and understood my requirements, and my quotation was turned around quickly. I had some technical questions regarding the threshold; and unlike other companies I dealt with, I was not treated as a nuisance and Ji (I hope I spelt this correctly!) talked me through everything. The surveyor arrived within a day of me signing and despite the current situation with many delays, they still installed within the quoted lead time!The Schuco bifolds we now have look amazing and we are so thrilled we went with Aspire Bifolds!Thanks alot Ji and Team.Cliff
Cliff Bentley T.
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14:33 04 Nov 20
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Thank you so much!
Cat P.
Cat P.
10:56 23 Sep 20
Aspire were great to work with and we are delighted with the finished product. We got bifolds, skylight, large side windows and french doors all for a highly competitive price. We had some unavoidable delays due to the pandemic but we were always kept in the loop with what was going on with our order. we are extremely pleased with the quality and value we got through working with them.
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12:32 11 Sep 20
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08:23 11 Sep 20
I would absolutely recommend Aspire Bifolds. They provided a great product at a reasonable price. Installation team was friendly and professional. They installed in less than a day.We also encountered a small issue with the measurement of the doors, but the leadership at Aspire was quick to cover additional costs incurred to rectify the issue. We really appreciated their professionalism on this matter.
Tim S.
Tim S.
06:54 10 Sep 20
Huge thank you to Aspire Bifolds for our external steel look doors, we’re so happy with them and the guys were quick, responsive and all around brilliant. Would really recommend Aspire Bifolds.
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Very efficient and helpful service 2 years on from original door fitting.Thanks so much Aspire!
Kim L.
Kim L.
11:00 27 Jul 20
Aspire bifolds removed some old wooden sliding doors and replaced them with some lovely French doors. They did a fantastic job- they spent time with me to ensure I had made the right choice of door, it took no time to fit them and the fitter was friendly, polite, clean and courteous. Quote was competitive and I couldn’t recommend them enough!
Natasha H.
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19:59 23 Jul 20
We went with Aspire after getting a few quotes, they weren't the cheapest but were still competitive. We chose them on the basis of their reviews and I am really glad we did! The service has been excellent throughout, our doors were installed far quicker than we were expecting, the fitter's attention to detail is great, and the quality of the doors is fantastic.After installation we did have a few problems with finding marks on the glass, which is provided by another firm, and had a few panes replaced. John, the director, ended up coming round himself and offered to replace the final pane. I know that many firms would just have ignored our calls once we had paid everything, so to have this level of service was fantastic. This proved our decision to go with a slightly more expensive firm in Aspire was the right move!
Scott S
Scott S
12:10 16 Jul 20
After a lot of research I came across Aspire Bifolds, went to the showroom and they have a very good selection of doors to choose from.From start to finish it's been a pleasure to deal with everyone connected to Aspire Bifolds and their aftercare service is first class.Top quality product, installation and all round experience from this company. Would have no hesitation in using them again.
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Catherine Kenton M.
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18:59 08 Apr 20
We recently used Aspire for purchase and installation of smart system heritage doors for our extension. We are thrilled with the finished product. John and the team are brilliant, every person I spoke to was helpful and friendly. Email response was really fast. The whole process from start to finish was seamless and stress free.The installers were efficient and tidy, they left the place cleaner than when they arrived. Following installation we noticed a scratch on one of the panes, we thought it could be buffed out, but the whole pane was replaced without issue within a week.It is rare to find a company with such great customer service and work ethic these days. I would certainly be happy recommending Aspire to anyone.
Rebecca D.
Rebecca D.
11:39 27 Feb 20
I visited Aspire Bifolds to discuss some technical details of the installation requirement for sliding doors. Both of the staff I dealt with were friendly and helpful and in particular Ji was able to answer all of my questions and demonstrate some of the details on the door installation in the showroom. Overall a very helpful visit.
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