Estimate what your window coverings could save on energy
Choose a location, a house type and one of the window coverings we sell, and see the modelled saving on total heating and cooling energy cost, the summer and winter split, and the carbon saved in kilograms a year. Modelled on official WSAA data for a representative home, not a measurement of your house.
Modelled energy savings
Energy saving by city, blockout curtains
In a single storey brick veneer house, whole home. Total energy cost saving.
| City | Opened by hand | Automated |
|---|---|---|
| Sydney | 10.7% | 19.05% |
| Melbourne | 9.02% | 12.56% |
| Brisbane | 10.02% | 33.51% |
| Perth | 16.89% | 30.25% |
| Adelaide | 12.37% | 20.28% |
| Hobart | 4.85% | 5.31% |
| Canberra | 7.15% | 9.62% |
| Darwin | 7.61% | 25.3% |
Energy saving by covering group, Sydney
The modelling works by fabric, not by product name, so coverings that share a fabric return the same figure. Every row is a single storey brick veneer house in Sydney, whole home. Total energy cost saving.
| Covering group | What is in it | Opened by hand | Automated |
|---|---|---|---|
| Plantation-style shutters | PVC shutters | 19.54% | 28.65% |
| Honeycomb cells | honeycomb blinds | 16.05% | 24.83% |
| Blockout fabric | blockout curtains, blockout and double roller blinds, roman, venetian and vertical blinds | 10.7% | 19.05% |
| Light filtering fabric | uncoated curtains, light filtering roller blinds | 10.27% | 18.69% |
| Sheer and sunscreen fabric | sheer curtains, sunscreen roller blinds | 8.98% | 15.86% |
That order holds in every capital except Hobart, where sheer fabric edges ahead of blockout.
Modelled estimates for a representative home, not a measurement of your house.
Modelled on official WSAA data.
Energy savings at a glance
- Modelled saving
- In whole-house modelling on official WSAA data, fitting blockout curtains to every window of a representative single-storey brick veneer home cuts total heating and cooling energy cost by 5% in Hobart, 9% in Melbourne, 11% in Sydney and 17% in Perth under manual operation. These are modelled estimates for a representative home, not a measurement of a specific house.
- Automated against manual
- Switching the same modelled home from manual to automated operation roughly doubles to triples the summer cooling saving, for example 16% to 56% in Sydney, 26% to 56% in Perth and 9% to 38% in Brisbane, while the winter heating saving stays flat or falls slightly. Automated results depend on the covering following the modelled operating schedule. These are modelled estimates for a representative home, not a measurement of a specific house.
- Carbon
- The carbon saved varies far more by city than the percentage saving does. The same modelled blockout curtain saves 49 kg of CO2 a year in Sydney, 114 kg in Melbourne and 208 kg in Darwin under manual operation, on total savings of 11%, 9% and 8%. These are modelled estimates for a representative home, not a measurement of a specific house.
- Method
- Figures come from whole-house modelling on official WSAA data. The modelled home is single-storey brick veneer, built between 2010 and 2021, single glazed and electrically heated, with the covering fitted to every window, face fitted with no pelmet. Only the postcode and the window covering change between runs. These are modelled estimates for a representative home, not a measurement of a specific house.
Learn more - Limits
- The model reports by product category and fabric type, so it cannot rate one fabric range against another, and it models one covering on a window at a time, so it produces no combined figure for a sheer and a blockout curtain on the same track. Automated results assume the covering follows the modelled operating schedule. These are modelled estimates for a representative home, not a measurement of a specific house.
- Motorised curtain tracks
- Automated operation means the covering opens and closes on a schedule rather than when someone remembers. On curtains that is a motorised curtain track, and we build our curtain tracks, motorised ones included, in our own factory in Western Australia. The energy figures describe a category of window covering and do not depend on where it was made.
Frequently Asked Questions
Where do the numbers in this calculator come from?
How accurate is the result for my house?
What does automated operation mean here?
Why does the same curtain save a different amount in each city?
Can the calculator tell me which fabric range performs best?
Does it estimate a dollar saving?
How this calculator works
This calculator runs your postcode through whole-house energy modelling built on official WSAA data. You choose a location, a house type and one of the window coverings we sell, and it returns the modelled saving on total heating and cooling energy cost, the summer and winter split, and the carbon saved in kilograms a year. It returns two versions of every answer: one for a covering you open and close by hand, and one for a covering that runs on a schedule. The house behind the numbers is a representative one, not yours. Unless you change it, the model assumes a single-storey brick veneer home built between 2010 and 2021, single glazed, electrically heated, with the covering fitted to every window and face fitted with no pelmet. The result is an estimate drawn from the typical insulating and optical performance of that class of product. It is not an assessment of the energy efficiency or thermal characteristics of any specific house. Results are reported by product category and fabric type. There is no per-range thermal rating behind them, because per-range thermal ratings do not exist for curtain fabrics unless a fabric has been specifically developed as a thermal product.
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