> 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/advanced-hvac/modelling-air-source-heat-pumps.md).
# Modelling air source heat pumps
An air source heat pump is a device that extracts heat from the outside air to provide indoor heating. They are increasingly used as a replacement for central gas boilers in providing hot water for central air handling unit systems.
{% hint style="success" %}
To model an air source heat pump, select the 'Hot Water Loop' on the HVAC Schematic. Then, click the 'plus' button next to 'Heating Devices and Pumps' and choose 'Air Source Heat Pump' from the menu.
{% endhint %}
---
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