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

Technology consultant at, a company from Poland that specializes in the export of windows and doors in the B2B segment to countries like Germany, France, UK, but also the USA or Seychelles.

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Aluprof MB-104 profile

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faq – who are we and what do we do?

1.What will I gain from working with you?

First of all, you’ll save your TIME. We will do the whole work with ordering doors, windows, gates, and blinds for you. Why should you outsource it to us? 
  • You will get products in a quality which was checked by us.
  • You don’t have to worry about meeting the deadline or financial condition of the supplier - we order the production only to verified companies.
  • We’ll find products that suit your needs - it doesn’t matter if that are windows, wooden or aluminum doors, PCV, blinds, or garage doors.
  • One complete transport at a lower price instead of a few different ones will come to the place of investment.
  • You’ll comfortably get everything done with one adviser, one invoice, one transfer, and only one place where you can (if necessary) make a complaint.

2. Does your company produce windows?

We aren’t just a traditional producer. We order the production of doors, windows, gates, and blinds inside of a network of selected and verified suppliers in terms of production punctuality, their financial condition, and the quality of products. We call ourselves the broker on a polish joinery market. We’ll do all of the arduous work with ordering the joinery from Poland for you. We’ll choose relevant products at an affordable price, organise safe transport and we’ll deliver the product to any address in the world. 

3. Do you have any stationary representatives in other countries?

We do not have any branches in other countries. Our office and a magazine are in Poland in Oleśnica (30 km from Wrocław).We overcome thousands of kilometers separating us from our clients owing to modern technologies. Thanks to that you’ll save your money and time because we don’t have to add any extra costs to the services or products to maintain expensive offices all over the world.

Delivery time, payment, installation, warranty

1. What is the delivery time on

The time of order processing is highly dependent on its specification. For example, white PCV windows, standard colors (anthracite on one side) can be ready for pick up or a shipment from 7 working days. The waiting time for nonstandard PCV colors is about 4 weeks depending on the color. The production time of PCV doors is also about 4 weeks. Aluminium doors and windows - from 3 weeks, wooden windows from 6 weeks. Furthermore, the blinds about 2 weeks, garage doors - about 3 weeks, metallic doors from 4 weeks. You’ll find estimated production time next to every product on its subpage.

2. How does the payment look like? Do I have to pay the whole amount immediately?

We suggest two forms of payment: 1. 50% of advance for production of the product and 50% shall be paid before picking up/ sending the goods. 2. 100% payment in advance. This form is much more favorable because we give you an additional 5% discount depending on the group of products.

3. Will I buy the joinery with an installation on

No, on we sell only windows, doors, blinds, and gates, which we deliver to every place in the world. The installation of the windows depends on the client. We do not offer installation service because our offer is not directed to the building companies, installers, developers, and realtors that can install the joinery by themselves.

4. If the windows would be installed by a different company, do the products keep the warranty?

Yes, the only condition is installing the product in accordance with the art of assembly and applicable standards in the country of the installation in terms of the warranty.

5. Do the products that I buy have a foreign warranty?

Yes, the only condition is installing the product in accordance with the art of assembly and applicable standards in the country of the installation in terms of the warranty.

Choosing the right aluminum windows

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