Inside or outside: stopping Hunter heat before the glass

What actually happens at hot glass

Sun hits the window, radiant heat passes through, and the floor, walls and furniture soak it up and re-radiate it into the room for hours. That is why a west-facing living room is still warm at nine in the evening. The Australian Government's YourHome guide puts it plainly: shading glass is the best way to reduce unwanted heat gain, because unprotected glass is often the greatest source of heat entering a home, and west-facing glass is a particular offender in hot climates.^[1]

An interior blind sits on the room side of that equation. By the time its fabric warms up, the heat is already inside; a good interior fabric reflects some of it back and slows the rest, which is genuinely useful, but it cannot un-admit heat. Exterior shade intercepts the sun before the glass, which is why it wins on the openings that bake.

The outside options

Mesh fabrics do most of this work: they cut the sun's load and the glare while keeping air moving and the outlook readable. Where a space should become a genuine outdoor room, a track-guided blind in a closer weave takes the verandah from "shaded" to "usable through a February afternoon".

When inside is the right answer

Plenty of warm rooms don't need exterior shade, and it would be dishonest to spec it for them.

• Glass that faces away from the sun's path. A south-facing room that runs warm has an insulation problem, not a radiation problem. A honeycomb blind's trapped-air cells hold the room's temperature both ways, summer and winter.
• Rooms where glare, not heat, is the complaint. A sunscreen roller in a dark fabric takes the sting out of the light and keeps the view. The room stays bright and workable.
• Upper-storey windows with no fixing options. Where an outdoor blind cannot be mounted or reached, a honeycomb plus a sunscreen is the honest interior ceiling on what can be done, and it is still a real improvement.
• Second lines of defence. The best-performing hot rooms in the Hunter usually run both: exterior shade to intercept, an interior layer for fine control and night privacy.

The Maitland pattern

On the schedules we build across the growth estates, the same opening keeps deciding the house: the wide west or north-west slider off the open-plan living area, usually with the alfresco beside it. Covered outside with a track-guided blind, that end of the house drops from unusable to ordinary on a hot afternoon, and the interior coverings behind it get to do their real jobs instead of fighting the sun. It is the clearest example we have of why cross-category advice matters; asked for "a blind for the living room", a single-category seller answers with the wrong side of the glass.