BRANZ has launched a preview of the new ALF, version 4. You can try out the preview version at now and let us know what you think.

 ALF 3.2: Annual Loss Factor

 Introducing ALF

The ALF (Annual Loss Factor) tool is a free online aid to the thermal design of houses. It is presented in a step-by-step format providing a simple method of calculating the energy performance of conventional New Zealand houses.

ALF3.2 is a verification method for determining the Building Performance Index (BPI), which can be used to show compliance with the Energy Efficiency Clause H1 of the New Zealand Building Code.

 Start a new project

 Contact and Feedback

Contact us at Branz for further information about the ALF 3.2: Annual Loss Factor.

 Create an ALF account

Register now to create your free ALF account.

Every user needs to create an ALF account. Creating an ALF account will ensure:

  • Confidentiality for your project.
  • Allow BRANZ to record usage of the ALF tool – BRANZ cannot access any individual projects. Your privacy is assured.