In a hot climate the window's job is to keep heat out while still giving light and air. Here's what to prioritise.
A frame that doesn't conduct heat helps — uPVC resists heat transfer, unlike untreated metal frames. This keeps the frame itself from becoming a heat path into the room.
Double glazing slows heat gain through the glass. On strongly sun-facing walls, tinted glass cuts glare and some heat too. These matter most on west- and south-facing openings.
Keeping heat out doesn't mean sealing the home up — casements and sliders that open well let you ventilate in cooler hours. The aim is control: shut out peak heat, open up when it helps.
uPVC frames with double glazing, and tinted glass on strongly sun-facing walls. The frame material and glazing together do the work.
Tinted glass reduces glare and some heat gain on sun-facing sides, which helps in the hottest rooms.
West- and south-facing openings get the most sun, so they benefit most from double or tinted glazing.
Related guides covering this topic from other angles — different products, applications, or contexts.
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