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Thermal performance

How can you improve the thermal comfort of your home with aluminium joinery?

22/12/2025

Do you sometimes feel too hot in summer, too cold in winter, or have the impression that your windows are leaking heat? Joinery plays a key role in the thermal balance of your home. Properly chosen and installed, aluminum joinery can improve your comfort and limit your energy costs.

Vue intérieure d'un salon dans une véranda en hiver.
Understanding

Aluminum, high-performance when well designed

It's sometimes said that aluminum insulates poorly. In reality, modern aluminum joinery incorporates a thermal bridge break: a barrier that limits the passage of cold and heat through the frame. The result: you gain in comfort, whatever the season, without giving up on slim, luminous profiles.

The 3 indicators to watch

Isolation

Uw

The lower it is, the better. It measures the insulation of the complete window.

Mini benchmark : Uw = 1.3 W/m².K ➡ Excellent

Sun

Sw

It indicates how much solar heat enters. Useful in winter, to be moderated in summer.

Light

Tlw

It measures light transmission. Ideal for keeping interiors bright.

Tip

Good dosage depending on orientation

For a south-facing room, look for a good balance: a low Uw to limit losses, and a moderate Sw to take advantage of the sun without turning the room into a greenhouse.

Don't forget

Every opening counts

Thermal comfort doesn't just depend on windows. Entrance doors, sliding doors, glass façades and conservatories also play a part in balancing the envelope. The idea: avoid "weak points" and aim for uniform performance, opening after opening.

Summer

Focus on outdoor sun protection

Sunbreakers, roller shutters or blinds: these protective devices limit overheating in summer, while keeping out the light. It's often the simplest adjustment to gain comfort, without major work.

Villa moderne équipée de grandes baies vitrées de couleur grise.
Night comfort

Adapt sensitive rooms

In an east- or west-facing bedroom, a sliding bay window with adapted glazing can help limit morning or evening heat peaks. You'll sleep better, without overheating the room.

Good reflex

Smart ventilation, with or without home automation

With well-placed openings (e.g. facing each other), you create pleasant natural ventilation. And with controlled blinds (programming, sensors...), you stabilize indoor temperature more easily on a daily basis.

The key point

Quality installation changes everything

An excellent window installed incorrectly can lose some of its performance. Careful installation limits air infiltration and thermal bridges, for long-lasting results. Installux relies on a network of partner manufacturers, for made-to-measure manufacturing and professional installation.

Maintenance

Clean seals, long-lasting waterproofing

Gaskets in good condition mean less stray air and less heat loss. A simple cleaning once a year is often all that's needed to maintain their efficiency.

Comfort
summer/winter

confort été/hiver

Light
maximum

Lumière maximale

Pose
professional

Pose professionnelle

Maintenance
easy

Entretien facile

Your questions about thermal comfort

Does aluminium really insulate?

Yes, if the joinery incorporates a thermal break and suitable glazing.

What does "Uw" mean?

This is the insulation indicator for the complete window: the lower it is, the better the insulation.

How to avoid overheating in summer?

Exterior solar protection (brise-soleil, blinds, shutters) are very effective in limiting solar gain.

Why is installation so important?

Improper installation can create air leaks and thermal bridges, degrading comfort and performance.

Vue intérieure d'un salon et bureau baigné de lumière naturelle.
Take action

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A partner carpenter can assess your openings, orientation and budget/comfort priorities, then suggest a suitable solution.

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