ALF4.0 (Annual Loss Factor) - A free tool for the thermal design of houses
- Valid from
- Information provider
- BRANZ Limited
- Information type
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.
ALF4.0 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.