Technical specifications for windows: what should you know?

Are you looking for new windows for your home? If you’ve already started your search, you’ve probably noticed just how many options there are. If you like things to be just right, design and colour matter — but so do the material and technical details. These small differences have a big impact on how comfortable your home feels. Think about safety features and energy efficiency — they all play a role.
But what do these technical terms actually mean for you? In this article, we’ll break down the most important aspects so you can make an informed choice.

Insulation value: how energy-efficient is your window?

Good insulation helps keep indoor temperatures stable. A window’s insulation level is always indicated by its U-value. This measures how much heat is lost per second, per square metre, when there’s a temperature difference between inside and outside. The lower this value, the better the window insulates. This directly affects heat loss in your home, which you’ll notice on your energy bill. For example, the U-value of a modern PVC window — a plastic window — is much lower than it used to be, which makes it far more energy-efficient.

Material choice: aluminium, PVC, or wood

Different materials each have their own pros and cons.

Aluminium windows

Aluminium windows, like those from Schüco, are strong, modern, and durable. They’re ideal for sleek façades and large window surfaces — perfect for multi-storey office buildings, for example.

Wooden windows

Wooden windows look stunning when they’re well-finished. They’re sturdy, long-lasting, and add a warm, natural feel. They’re often chosen for country-style or classic homes and are typically made from oak or mahogany — but there are plenty of other options too.

PVC windows

These are popular because they’re easy to maintain and offer good value for money. Modern versions, like Deceuninck windows, often have burglar-resistant locks and/or sound-dampening ventilation grilles. The grilles help keep your home nice and fresh.

So, what should I choose?

Whether you go for aluminium or PVC windows, good preparation means you’ll enjoy comfort, security, and lower energy costs for years to come. Do your research and maybe even ask an AI tool like ChatGPT to help you compare prices. It’s a big investment — planning ahead is key. And no matter the season, you’ll be able to look outside and enjoy the view!