Window Energy Ratings Australia: How Plantation Shutters Stack Up
If you've been researching energy-efficient window coverings, you've probably come across the term WERS — the Window Energy Rating Scheme. But what does it actually mean, and how do plantation shutters compare to other window treatments?
What Is WERS?
The Window Energy Rating Scheme (WERS) is Australia's official system for rating the energy performance of windows and window coverings. Administered by the Australian Window Association (AWA), WERS rates products on:
- Solar heat gain — how much heat enters through the window
- U-value — how much heat is lost through the window in winter
- Visible light transmittance — how much natural light passes through
Ratings are expressed as a star system — the higher the stars for winter, the better the insulation. The higher the stars for summer, the better the heat rejection.
Why Energy Ratings Matter for Australian Homes
Australia's climate is extreme — scorching summers in Queensland and the NT, freezing winters in Victoria, Tasmania, and the ACT. The right window covering can:
- Reduce heating and cooling costs by up to 40%
- Improve year-round comfort without running your aircon constantly
- Contribute to a higher NatHERS energy rating for new builds
- Reduce your household carbon footprint
With energy prices continuing to rise across Australia, the ROI on quality window coverings has never been stronger.
How Plantation Shutters Perform
Plantation shutters are one of the highest-performing window coverings for energy efficiency, and here's why:
Insulation
Plantation shutters — particularly polymer and timber shutters — create a physical barrier between the glass and your living space. When louvres are closed, they trap a layer of air that acts as insulation, reducing heat transfer in both directions.
Summer Heat Rejection
Closed or angled louvres reflect direct sunlight before it enters the room, significantly reducing solar heat gain. This means your aircon works less hard to maintain a comfortable temperature.
Winter Warmth Retention
In cooler months, closed shutters reduce cold air infiltration around window frames and slow the rate at which warm air escapes through the glass — particularly valuable in older homes with single-glazed windows.
Light Control Without Sacrificing Ventilation
Unlike blockout blinds, plantation shutters let you angle the louvres to control light and heat while still allowing airflow — a major advantage in Australia's shoulder seasons when you want fresh air without direct sun.
Plantation Shutters vs Other Window Coverings
| Window Covering | Summer Heat Rejection | Winter Insulation | Light Control |
|---|---|---|---|
| Plantation Shutters | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ |
| Honeycomb Blinds | ⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐ |
| Blockout Roller Blinds | ⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐ |
| Sheer Curtains | ⭐ | ⭐ | ⭐⭐ |
| Venetian Blinds | ⭐⭐⭐ | ⭐⭐ | ⭐⭐⭐⭐ |
Are Plantation Shutters WERS Rated?
Not all plantation shutters carry a formal WERS rating — the scheme is more commonly applied to glazing products. However, the thermal performance of plantation shutters is well documented and recognised by energy assessors under NatHERS (Nationwide House Energy Rating Scheme).
If you're building a new home or undertaking a major renovation, your energy assessor can factor in plantation shutters as part of your overall window treatment strategy to improve your star rating.
The Bottom Line
If energy efficiency is a priority — whether for comfort, cost savings, or environmental reasons — plantation shutters are one of the smartest investments you can make in your home's windows.
They're durable, low maintenance, and deliver year-round performance that cheaper window coverings simply can't match.
Ready to Explore Plantation Shutters for Your Home?
At Blinds Downunder, we supply premium Australian-made and imported polymer plantation shutters — built to handle Australia's toughest climates and designed to last decades, not years.
Shop our Premium Polymer Plantation Shutters →
Not sure which option is right for your home? Browse our full range and order free samples to see the quality for yourself before you buy.
- Blinds Downunder
