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Category Archives: Energy Assessment Tools

Including NatHERS Universal Certificate in Residential Assessments

Sustainability House created the NatHERS Universal Certificate. It was introduced to provide a uniform method of reporting building design elements and assessment results. For more information on the development of the Universal Certificate see here.
This article begins with who can […]

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Roof Insulation Compression Calculator

When fibre insulation is compressed (to fit into a tight space, squished underneath purlins or even by a retaining mesh), its R-value decreases. This change isn’t a simple linear reduction, but a complex curve that’s different for each material.
To assist […]

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Explanation of terms used in the Energy Efficiency Industry

There’s so many terms specific to the Energy Efficiency industry that it can be hard to keep track of them all. Here’s a list of some of the ones we use, plus what they mean.


α (greek alpha)
The Solar Absorptance of a […]

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Optimal Window Eaves Shading

Following from Window Design for House Efficiency the contribution of windows to the total building Energy Efficiency is considered. The BERS 3.2 thermal simulation was used to determine the optimum eaves width for glazing of different heights. The optimum was […]

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Confused by all the complicated words & jargon in the Energy Efficiency Industry? We've put together a brief explanation of common Energy Efficiency terms.

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