> For the complete documentation index, see [llms.txt](https://docs.betterbuilding.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/h1-as1.md).
# H1/AS1
Our H1/AS1 modelling approach is unique, where the modelling requirements of H1/AS1 are set and reporting is automated. This approach saves significant time and effort, enabling design optimisation to be the focal point. A typical residential building is simulated in less than an hour, including simulations and results.
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