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Thermal Performance

Design Principles

THERMAL PERFORMANCE | Design Principles

BASIX encourages you to choose a design that is appropriate to the climate that the dwelling will be located in (which is also referred to as passive design principles). This includes:

  • Orientation—balancing solar access for winter warming (if required) while avoiding overheating in summer.
  • Windows—balancing heat, light, ventilation and views.
  • Ventilation—managing cooling breezes and reducing uncontrolled air leakage.
  • Ceiling fans—providing very energy efficient cooling of the occupants.
  • Insulation—reducing uncontrolled heat gain and loss through the building fabric.
  • Addressing thermal bridging—addressing any unintended heat flow between the outside and inside of the building.
  • Thermal mass—stabilising internal temperatures especially when there is a large day-night temperature range.
  • Shading—balancing heat, light and glare.
  • Roof colour and solar absorptance —making changes so the home absorbs less (or more) heat
  • Roof space ventilation—cooling the home by allowing hot air and excess moisture to escape
Last updated: 23/12/2025