Local conditions
Humidity moves timber. Salt finishes the hardware.
Two Streets From The Water Changes Everything
Brisbane and the Gold Coast run months of high humidity at a stretch, and timber responds to humidity by moving. In a formal lounge with the air conditioning on, that movement is small enough to ignore. In an ensuite, a laundry or a west-facing bedroom that gets shut up all week, it is the difference between a louvre that closes and one that has to be forced.
The second problem is the one that decides the lifespan, and it is never the panel. It is the hardware. Airborne salt reaches a good deal further inland than people expect, and it goes for hinges, magnets and screws long before it touches the shutter itself. If you are within a few streets of the water, ask what the hardware is made of — not what the blade is made of.
Shutters also do something no blind does: they are a physical layer of insulation over the glass, which matters more here than a brochure suggests. Pair them with the right glazing and a west-facing room stops being a room you avoid between three and five.