uPVC vs Aluminium Frames for Double Glazed Windows
When homeowners compare double glazed windows, the glass is only half the story — the window frame material plays a major role in comfort, energy efficiency, condensation control, and long-term performance.
Two of the most common options for modern double glazed window systems are uPVC frames and aluminium frames. Below is a practical comparison to help you understand which frame works best for your home.
1️⃣ Thermal performance of double glazed windows
The purpose of double glazed windows is to reduce heat transfer and improve indoor comfort. The frame can either support that benefit or undermine it.
uPVC frames
- Naturally insulating (low conductivity)
- Support consistent thermal comfort alongside an insulated glass unit (IGU)
- Help reduce heat loss in winter and heat gain in summer
Aluminium frames
- Very strong but naturally conductive
- Often require thermal break technology to perform similarly
Takeaway: uPVC is usually best for thermal performance. Aluminium can still perform very well when it’s a thermally broken system.
2️⃣ Condensation and moisture control
Condensation is common when warm indoor air meets a cold surface.
- uPVC frames tend to stay warmer internally, reducing condensation risk
- Aluminium frames can be colder without thermal breaks
Result: uPVC often performs better for condensation control in residential settings.
3️⃣ Noise reduction
While glazing does most of the sound reduction, the frame affects sealing performance.
- uPVC multi-chamber frames support airtight seals
- Aluminium systems perform well when properly sealed
Key point: glazing choice + installation quality matter most for noise reduction.
4️⃣ Design, strength, and appearance
- Aluminium allows slimmer, modern profiles
- uPVC provides slightly thicker frames but strong stability
- Both work well in residential applications
Design rule: Aluminium suits architectural aesthetics, uPVC suits energy-efficient comfort.
5️⃣ Maintenance and lifespan
Both frame types are low-maintenance.
| Feature | uPVC | Aluminium |
|---|---|---|
| Painting needed | No | No |
| Corrosion risk | Very low | Low with correct finish |
| Lifespan | Long-term | Long-term |
6️⃣ Value and performance
Many homeowners choose uPVC double glazed windows for the balance of:
- Strong insulation
- Low maintenance
- Reliable long-term comfort
Aluminium remains popular for modern design and slim sightlines.
The most important point
Whether uPVC or aluminium, the biggest gains come from:
✔ Proper glazing selection
✔ Quality seals
✔ Professional installation
The frame supports performance — but the complete window system matters most.
Need help choosing the right double glazed windows?
If you’re comparing options in Melbourne, we can guide you on the best combination of frame and glass based on your home’s orientation, noise exposure, and budget.
Frequently Asked Questions
For most residential homes, uPVC frames provide better thermal insulation and everyday comfort because they are naturally insulating. Aluminium frames are popular for slim modern designs, but to achieve similar performance they usually need thermal break technology. The best choice depends on whether comfort or architectural appearance is the priority.
Yes. Standard aluminium conducts heat and cold, which can reduce the energy efficiency of double glazing. Thermally broken aluminium frames include an insulating barrier that significantly improves comfort and reduces condensation risk.
PVC frames generally reduce condensation risk because the interior surface stays warmer. Aluminium frames can become colder in winter, especially if not thermally broken, which may increase condensation on the inside.
In most residential situations, yes. uPVC is naturally insulating, while aluminium requires additional thermal technology to achieve similar efficiency. When combined with high-performance glazing, uPVC frames can significantly improve indoor comfort and reduce heating and cooling costs.
Noise reduction depends mainly on the glass configuration and sealing quality rather than the frame material. Both uPVC and aluminium frames can perform well when paired with acoustic glazing and installed correctly. Proper sealing is critical for sound insulation.
Pricing varies by system, size, and glass specification. uPVC often offers strong performance for the price, while thermally broken aluminium systems can be more expensive due to manufacturing complexity and design features.
