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+---
+author: epenet
+authorURL: https://github.com/epenet
+title: "Deprecate Unit System constants and properties"
+---
+
+As of Home Assistant Core 2022.11, the `is_metric` and `name` properties of a unit system are deprecated 
+and should not be used.
+
+Custom integrations referencing these properties will need to be adjusted to use instance checks instead.
+
+Correct:
+```python
+if hass.config.units is IMPERIAL_SYSTEM:
+    pass
+
+if hass.config.units is METRIC_SYSTEM:
+    pass
+```
+
+To avoid confusion with future unit systems, the constants `CONF_UNIT_SYSTEM_IMPERIAL` 
+and `CONF_UNIT_SYSTEM_METRIC` are also deprecated and should no longer be referenced:
+  - if they were used to compare against the `name` of a unit system, 
+  then this is no longer needed.
+  - if they were used for another reason, then local constants should be created instead.