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Guide · heat
Blinds for west-facing rooms
Morning sun arrives high and leaves early. Western sun arrives low, stares straight through the glass, and stays until it sets, right through the hours the family room is busiest. That's why the west room is the one everyone complains about, and why it deserves a plan instead of a bigger air-con bill.
The order of operations
Heat management is about where you intercept the sun. Each step inward is less effective and more convenient; a good spec is honest about the trade.
- 1. Outside the glass. External shading, awnings, outdoor blinds, eaves doing their job, stops solar energy before it enters. The Australian Government's YourHome guidance puts effective external shading capable of blocking most of the solar heat gain through glass; nothing indoors competes with that. For a brutal west wall, an outdoor blind is the strongest single move.
- 2. At the glass, with an air gap. A snug-fitting honeycomb (cellular) blind traps still air against the window, fabric double glazing. It's the best interior answer for a room that must stay a room: lower it as the sun comes around, and it also slows winter heat loss all through July.
- 3. At the fabric. A blockout roller with a reflective backing rejects a useful share of the load and, just as importantly for the humans, kills the glare that makes the room feel hotter than it is. Fitted tight, it's a solid, affordable answer for bedrooms on the western side.
What no interior fabric can do
Once the sun's energy has passed the glass, part of it is in the room to stay; a fabric can reflect some back and slow the rest, but it cannot air-condition. Anyone promising a blind that makes a west room cold is selling something. What the right blind honestly delivers: the glare gone, the radiant sting gone, the afternoon peak flattened, and a room you stop avoiding at 4pm.
The habits multiply the hardware
A west blind works best before the sun lands on the glass, lowered mid-afternoon, not at the point of surrender. This is the one place motorisation earns its keep on a schedule: a timer drops the west bank at three o'clock whether anyone remembers or not. More in the mechanism guide.
What we actually spec, window by window
On a typical estate-home rear: honeycomb on the fixed panes and sliders where the room lives, backed blockout in the west bedrooms, and a straight recommendation for an outdoor blind if one wall takes it worst, even though outdoor is our supporting line, not our lead. Orientation decides; the room's job refines. That's the whole method, and the window finder runs it for your own windows in a minute.
Sources
YourHome (Australian Government): Shading, on external shading blocking solar heat gain before the glass. YourHome: Windows and glazing, on windows as the main path for unwanted heat gain and loss, and snug-fitting insulating window coverings.