As Australia’s building industry continues its shift toward energy efficiency and sustainability, thermal performance modelling has become one of the most valuable skills a building designer, energy assessor or sustainability professional can hold. Within the Nationwide House Energy Rating Scheme (NatHERS), this modelling forms the foundation for predicting how comfortably — and how efficiently — a home will perform for the people living in it.
What is thermal performance modelling?
Thermal performance modelling is the process of building a digital representation of a residential home using NatHERS-accredited software such as AccuRate HERO, FirstRate5 or BERS Pro. The model draws together a wide range of building data, including orientation, construction materials, insulation levels, glazing specifications, shading devices and local climate conditions, to create an accurate picture of how the home will behave.
How the simulation works
Once the building information is entered, the software runs thousands of calculations to simulate the home’s thermal behaviour across a full year of changing weather. These simulations track how heat enters, escapes and moves through the building envelope, producing two key outputs: the home’s annual heating and cooling loads, and its NatHERS star rating, on a scale from 0 to 10 stars.
Where the real skill lies
Some of the most rewarding challenges in this field come from understanding how glazing, shading and orientation interact — because even small design decisions can make a big difference to outcomes. Increasing north-facing glazing, for instance, can boost valuable winter solar gains, while too much west-facing glazing can significantly increase summer cooling loads. Getting the balance right, along with selecting the best-fit insulation levels and construction systems, is central to achieving strong energy efficiency outcomes and NCC compliance.
Thermal performance modelling is about far more than ticking a compliance box. Skilled assessors use their modelling results to uncover genuine opportunities for design optimisation, helping builders and homeowners create homes that are more comfortable to live in, cheaper to run and better for the environment. Doing this well calls for a solid grounding in building physics, passive design principles and confident software interpretation — exactly the kind of expertise that’s now in strong demand across the industry.
Build this in-demand skillset with EIB
For those ready to develop these highly sought-after skills, Education in Building (EIB) offers comprehensive, industry-focused training through the Certificate IV in Home Energy Efficiency and Sustainability. Students gain hands-on experience with NatHERS-accredited software, learn to confidently interpret modelling outcomes, and apply energy efficiency principles to real residential projects under expert guidance.
Whether you’re just starting your journey into sustainability assessment or looking to sharpen your existing building industry expertise, EIB gives you the practical skills and confidence to thrive in the fast-growing field of home energy assessment. Request a free quote here: Quote Form
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