# How do I specify a party wall?

Click on the wall you want to specify and use the drop down menu to select whether the other side of this wall is a heated or unheated space. By default the drop down will be set to *Outside*.

[![image.png](https://help.heatpunk.co.uk/uploads/images/gallery/2026-09/scaled-1680-/woT2nbbhNqNFFXEk-image.png)](https://help.heatpunk.co.uk/uploads/images/gallery/2026-09/woT2nbbhNqNFFXEk-image.png)

For more information on this topic see our guide on [creating floor plans](https://help.heatpunk.co.uk/books/plans-task/page/creating-a-floor-plan "Creating a Floor Plan").