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Rename IMPERIAL_SYSTEM to US_CUSTOMARY_SYSTEM (#1500)

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* Rename IMPERIAL_SYSTEM to US_CUSTOMARY_SYSTEM

* Update 2022-10-14-deprecate-unit-system.md

* Delete 2022-10-18-rename-imperial-unit-system.md

* Update 2022-10-14-deprecate-unit-system.md

* Update 2022-10-14-deprecate-unit-system.md
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---
author: epenet
authorURL: https://github.com/epenet
title: "Deprecate Unit System constants and properties"
title: "Deprecate IMPERIAL_SYSTEM unit system and linked 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.
As of Home Assistant Core 2022.11, the `IMPERIAL_SYSTEM` is deprecated, replaced by `US_CUSTOMARY_SYSTEM`.
The `is_metric` and `name` properties of a unit system are likewise deprecated and should not be used.
Custom integrations referencing these properties will need to be adjusted to use instance checks instead.
Custom integrations referencing this unit system or these properties will need to be adjusted to use instance checks instead.
Correct:
```python
if hass.config.units is IMPERIAL_SYSTEM:
if hass.config.units is METRIC_SYSTEM:
pass
if hass.config.units is METRIC_SYSTEM:
if hass.config.units is US_CUSTOMARY_SYSTEM:
pass
```