uPVC vs Aluminium Windows: Which Is Right for a Sydney Home?
Most Sydney homes built before the last decade were fitted with single glazed aluminium windows. They are cheap to produce and slim to look at, but the material itself is the problem: aluminium is an excellent conductor, so the frame carries heat straight through the wall line, into the house in summer and out of it in winter.
Where aluminium loses
Even a thermally broken aluminium frame only interrupts part of that bridge. The metal still moves heat far faster than plastic, which is why aluminium frames sweat with condensation on cold mornings and feel cold to the touch in winter. Near the coast, untreated aluminium also pits and corrodes in the salt air.
Where uPVC wins
uPVC is a poor conductor by nature. Combined with a multi-chamber internal structure, five or six sealed air pockets inside the frame, it insulates the way European homes have for decades. Frame U-values start as low as 0.77 W/m2K, well below typical aluminium systems, and the frame stays close to room temperature so condensation and cold spots largely disappear.
What it means day to day
- Lower heating and cooling bills, with customers reporting reductions of up to 30 percent after replacement
- Up to 45dB of noise reduction when paired with acoustic laminated glass
- No corrosion, so frames hold their finish in beachside and harbour-front homes
- Low maintenance, with no repainting and simple cleaning
Aluminium still suits some budgets and heritage sightlines, but if comfort and running costs matter, uPVC is the stronger long-term choice for the Sydney climate. The honest way to decide is to compare sample frames side by side during a free measure.