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Thermal Performance Assessments


Q: What is Thermal Performance Assessment?

A: A Thermal Performance Assessment (also commonly known as a House Energy Rating, or a NatHERS/Accurate Rating) is an assessment of how comfortable the temperature in your house will be throughout the year.

It primarily assesses the thermal performance of the building envelope elements (walls, floors, roof, windows, insulation) to determine the home’s ability to remain comfortable with as little artificial heating or cooling as possible.

All states in Australia require new houses to meet minimum thermal performance standards. Some states have requirements for existing home owners to declare the home’s thermal performance at point of sale.

A Thermal Performance Assessment conducted by NatHERS & BASIX Solutions can be used to show compliance with:

• the Building Code of Australia (Verification method), and
• the BASIX® Thermal Comfort (Simulation method), and
• Mandatory Disclosure at point of sale (ACT only).

Q: How is a Thermal Performance Assessment done?

A: NatHERS & BASIX Solutions conduct Thermal Performance Assessments by inputting your house design into an approved computer software package. The rating is based on building fabric components (e.g. walls, floors, roof, windows, insulation), climatic data (from weather data files), and occupancy settings.

We are ABSA Accredited. ABSA Accreditation is the only nationally recognised standard for Assessor training and Quality Assurance which meets the requirements of the Building Code of Australia and the NSW Building Sustainability Index (BASIX®). In some states it is mandatory to use an Accredited Assessor to carry out Building Thermal Performance Assessments.

We will provide you with a stamped ABSA Certificate (which is required by Councils to be lodged with your Development or Building Application) and will stamp your plans accordingly. In the event that your design does not meet the required minimum standard, we may suggest some alternatives to improve the performance of your house design.

The approved software used to generate a rating varies by state – the main tools used in Australia Accurate and BERS and are validated using a national standard. The simulation engine upon which all tools are based was developed by the CSIRO in consultation with state and federal governments.
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