Choosing the right aluminum windows

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Let’s face it — aluminum windows are an expensive investment, but they are worth the price. Why? Foremost, these windows are more durable, can withstand larger dimensions and loads, and are easier to maintain. So what are the key aspects when choosing aluminum windows?

After reading this article you will know:

What to look out for when choosing aluminum windows?

Price and reliability of the supplier

There is no need to deny it — for customers, the right price is one of the most important aspects when acquiring goods. Aluminum windows can be two times more expensive than for example PVC models, you have to find a reliable supplier. Choosing the wrong provider may lead to a variety of problems, ranging from delays to unsatisfactory quality. The second matter is the huge price difference for the same window systems between various fenestration suppliers, as they can fluctuate up to several dozen percent.

debesto works only with credible factories, additionally, we constantly monitor the fenestration market in Poland, thanks to this, you can be sure that by entrusting us with your order, you do not overpay for the purchased goods, and their quality will be at the highest level.

Our company also offers you free project consultations that will help you manage your budget and dispel doubts related to e.g. local construction requirements.

Thermal insulation

In the beginning, let’s establish that the more insulation, the warmer the window is. But it should be remembered, that panes have the greatest impact on the U-Factor, since they occupy the largest area of the window.

*U-Factor — parameter of the thermal insulation value of the window

In terms of thermal insulation, aluminum windows can be divided into cold and warm windows.

Cold profiles do not have thermal insulation inside the frames and are dedicated to the internal building only.

On the other side, warm aluminum profiles have thermal spacers that are usually made of polyamide or foam. You can also add additional spacers, which also improves their thermal properties.

Warm and cold aluminium profiles Aluprof MB-79N vs MB-45
“Cold” profile“Warm” profile
Window systemAluprof MB-45Aluprof MB-79N
Thermal spacersNOYES
Glazing2 panes (Ug 1,0)2 panes (Ug 1,0)
U-Factor of the selected window*0.44 BTU/ft20.23 BTU/ft2

*selected window RU 1230 x 1480 mm, 2 panes (Ug 1,0), warm inter-pane frames

Height of the frame and sash assembly

The height of the frame and sash assembly is another element that affects the window thermals the lower the fold, the larger the glass area, which is why narrow-frame profiles have been gaining popularity recently.

This trend awakened the rivalry between aluminum fenestration producers that compete in creating systems with the lowest possible folding of the frame with the sash, which also allow as much light as possible to enter the room. Another advantage of the standard profiles with low folding is the slightly lower price of the windows, since the material consumption is lower.

From an aesthetic point of view, you have to remember that the larger the dimensions of the structure with the sash are, the higher the folding height can be — this is related to the maximum loads that a given sash and fitting can have. With larger constructions, however, the differences in the height of the assemblies are not that noticeable.

Allowed dimensions and loads

Each window system has its own maximum dimensions and load — this is another parameter that determines which system you should choose for your investment, for instance, if you want a 3-meter entrance, without the need to divide the structure into a lower sash and transom, the number of available options becomes significantly lower. But fret not — debesto’s technical consultants will help you choose solutions that meet your needs.

Aluminum windows – are they worth investing in? What are the advantages of aluminum fenestration?

The strengths and advantages of aluminum windows include, for example,

  • being more resistant to weather conditions and scratches, for that reason, aluminum windows can remain in an unchanging state for several dozen year
  • it can withstand heavier loads, for instance, the longest acceptable side of the window in PVC is approx. 3 meters, in aluminum it can be as much as approx. 4 meters
  • they do not require additional care like constructions made from wood
  • thanks to varnishing, such profiles are more durable than veneered PVC profiles, you can choose from various options for finishing the structure, e.g. it can be wood-like, matte, glossy or with a fine sand texture
  • aluminum profiles can be covered with all colors from the RAL palette, they can also be two-colored – a different tint and finish from the inside and outside

And what if you do not want to pay more for aluminum windows, but you care about their aesthetic aspects? Even when you have a limited budget, there are now more and more PVC systems on the market that imitate aluminum profiles. One of them is, for example, Gealan Linear.

Comparison of aluminum windows based on selected Aluprof profiles

Based on individual Aluprof window systems, let’s analyze the differences between cheap “warm” profiles, energy-saving models and passive aluminum windows, which are characterized by a low heat transfer coefficient. We will also learn what effect additional thermal insulators actually have on the overall thermals.

MB-70 ST3 panes (48 mm)493 EUR0.1793 mm
MB-70 HI3 panes (48 mm)512 EUR0.1793 mm
MB-79N ST3 panes (48 mm)471 EUR0.1697 mm
MB-79N SI3 panes (48 mm)492 EUR0.1497 mm
MB-86 ST3 panes (48 mm)537 EUR0.1497 mm
MB-86 SI3 panes (48 mm)545 EUR0.1597 mm
MB-86 AERO3 panes (48 mm)624 EUR0.1497 mm
MB-104 Passive3 panes (48 mm)650 EUR0.13103 mm

*selected window RU 1230 x 1480 mm, RAL 7016, 3 szyby 48 mm (Ug 0.5), warm frame, aluminum handle, installation anchors
**without extra charge from a proven manufacturer
ST = standard, HI/SI/AERO = additional thermal insulators

Based on the table above, we can find out that:

Aluprof MB-79N Standard:

  • is about 5% cheaper than its older version MB-70 ST
    • is based on the MB-70, it looks almost the same from the outside, but has better thermals and a slightly higher minimum folding of the frame with the sash at no extra charge
    • this model can achieve an even lower fold, which is 90 mm, by changing the hinges from visible to hidden for an additional cost
    • has the same U-Factor parameter as MB-70 with an additional HI insulator, but it is cheaper by approx. 8%
    • with an additional SI thermal spacer, this profile is a good, cheaper alternative to the standard MB-86 version

MB-104 Passive:

  • is a good option when you are looking for a window with good thermal parameters, corresponding to passive windows
  • although it is more expensive than the MB-86 AERO by about 4%, its U-Factor parameter improves notably
  • has a higher fold which is already over 100 mm

You should remember that passive systems require a different assembly than standard window systems, but we will talk about it in a separate article.

Apaft from Aluprof products, debesto also offers products from other leading aluminum fenestration system providers, such as Reynaers, Cortizo, Aliplast, Ponzio, Yawal, Deceunnick, or Schüco. 

Agata Toczek debesto technologist

about author

Agata Toczek

I’m the Team Leader of the Technology Team at debesto, where I manage a group of technologists dedicated to assisting our clients with the technological aspects of their window projects. 

Starting as the first technologist at debesto consulting for US customers – many of whom are still with us today – I share my extensive knowledge and experience in fenestration technology and in researching our clients’ project technological needs. 

Outside of work, I have a passion for the history of the Lower Silesia area in Poland, building family trees, and photography.
Connect with me

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faq – who are we and what do we do?

At, we are experts in providing customized window solutions, including patio doors, blinds, entry, and garage doors, tailored to building professionals: developers, general contractors, architects, and construction project managers.   With over a decade of expertise in European windows, we specialize in assisting construction companies to import windows efficiently and profitably.   With debesto, you gain comprehensive, consultative partnerships designed to enhance your project’s success and minimize your business risk. Our customers appreciate most:
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Delivery time

What is the lead time of an average order?

The total time from manufacture to delivery of the windows to the US port is on average 7-10 weeks depending on the destination port and delivery method that you can choose from debesto delivery price list.

Add to this the production time of the windows (from 2 to 8 weeks).

The maximum expected production time can be found on the pro forma invoice. We deliver 97% of all orders shipped worldwide according to the deadline we declare on the pro forma invoice. If we are late, we give you a 2% discount.

More questions about the delivery? Check Frequently Asked Questions about importing windows to the US

Warranty and safety

Do the products come with an international warranty?

Yes, products are covered by the debesto worldwide warranty, provided they are installed according to the professional standards and applicable regulations in the country of installation.

Are the windows insured during shipment?

Yes, all products are fully insured during transportation, covering the entire value of the products.

Any concerns about potential issues with windows from Poland? Discover 5 main reasons for complaints and ways to solve them

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