Which insulates better, uPVC or aluminium? This is where they genuinely differ.
Aluminium window frames are strong and slim, which lets them carry large panes with thin sightlines. But aluminium conducts heat readily, so an aluminium frame transmits more heat than uPVC unless it has a thermal break.
uPVC frames are multi-chambered — the hollow chambers trap air, which slows heat transfer. That makes uPVC naturally insulating without needing a thermal break.
This is the one comparison where the answer is clear-cut: uPVC insulates and aluminium conducts. Aluminium can be made to insulate with a thermal break, but it needs that added component to reach where uPVC starts.
uPVC, clearly — its multi-chambered frame traps air and slows heat transfer naturally. Aluminium conducts heat readily and needs a thermal break to compete.
An insulating barrier inside an aluminium frame that interrupts heat conduction. uPVC doesn't need one — its chambers do the job.
Yes — in our heat, a conducting frame brings warmth into the room. It's the main reason we build in uPVC.
Related guides covering this topic from other angles — different products, applications, or contexts.
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