Aluminium vs uPVC windows in UAE heat: which should you choose?
The short answer
For most UAE homes, thermal-break aluminium is the better long-term choice. It stays straight and keeps its colour in 50°C sun, allows slimmer frames and larger glass, and with double glazing it insulates about as well as uPVC. uPVC can be cheaper for small standard windows, but white uPVC can yellow and large uPVC frames can bow in the heat.
How the two materials handle UAE heat
uPVC is a plastic. It insulates well because plastic conducts little heat, but it expands more than aluminium as it heats up and softens slightly at high surface temperatures. Dark-coloured uPVC frames on west-facing walls can reach temperatures where large sashes start to bow. Aluminium is a metal: it does not soften or warp at any temperature a building reaches, but it conducts heat, which is why a thermal-break profile matters.
Side by side
| Thermal-break aluminium | uPVC | |
|---|---|---|
| Insulation | Very good with DGU | Very good |
| Strength and size | Large, slim frames | Thicker frames, size limits |
| Colour in the sun | Stable powder coat | White can yellow over time |
| Coastal air | Good with coastal coating | Good |
| Upfront cost | Higher | Lower for standard sizes |
When uPVC makes sense
uPVC is a reasonable choice for small, standard-size windows in shaded positions where budget is the main concern, or where the building already uses uPVC and the new windows must match.
When aluminium is the clear winner
- Large sliding doors and picture windows
- Dark or colour-matched frames on sunny facades
- Slim sightlines and a modern look
- Commercial buildings and curtain wall
Whichever you choose, the glass matters as much as the frame. Double glazing with a Low-E coating on sun-facing rooms makes the biggest difference to comfort and cooling bills.