Deprecate TemperatureConverter.convert_interval (#155689)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Erik Montnemery <erik@montnemery.com>
Co-authored-by: epenet <6771947+epenet@users.noreply.github.com>

homeassistant/components/alexa/handlers.py

@@ -58,7 +58,10 @@ from homeassistant.const import (
 from homeassistant.helpers import network
 from homeassistant.util import color as color_util, dt as dt_util
 from homeassistant.util.decorator import Registry
-from homeassistant.util.unit_conversion import TemperatureConverter
+from homeassistant.util.unit_conversion import (
+    TemperatureConverter,
+    TemperatureDeltaConverter,
+)
 
 from .config import AbstractConfig
 from .const import (
@@ -844,7 +847,7 @@ def temperature_from_object(
         temp -= 273.15
 
     if interval:
-        return TemperatureConverter.convert_interval(temp, from_unit, to_unit)
+        return TemperatureDeltaConverter.convert(temp, from_unit, to_unit)
     return TemperatureConverter.convert(temp, from_unit, to_unit)
 
 

homeassistant/util/unit_conversion.py

@@ -38,6 +38,7 @@ from homeassistant.const import (
     UnitOfVolumetricFlux,
 )
 from homeassistant.exceptions import HomeAssistantError
+from homeassistant.helpers.deprecation import deprecated_function
 
 # Distance conversion constants
 _MM_TO_M = 0.001  # 1 mm = 0.001 m
@@ -707,6 +708,9 @@ class TemperatureConverter(BaseUnitConverter):
         )
 
     @classmethod
+    @deprecated_function(
+        "TemperatureDeltaConverter.convert", breaks_in_ha_version="2026.12.0"
+    )
     def convert_interval(cls, interval: float, from_unit: str, to_unit: str) -> float:
         """Convert a temperature interval from one unit to another.
 

tests/util/test_unit_conversion.py

@@ -1302,11 +1302,19 @@ def test_unit_conversion_factory_allow_none(
     ],
 )
 def test_temperature_convert_with_interval(
-    value: float, from_unit: str, expected: float, to_unit: str
+    value: float,
+    from_unit: str,
+    expected: float,
+    to_unit: str,
+    caplog: pytest.LogCaptureFixture,
 ) -> None:
     """Test conversion to other units."""
     expected = pytest.approx(expected)
     assert TemperatureConverter.convert_interval(value, from_unit, to_unit) == expected
+    assert (
+        "The deprecated function convert_interval was called. It will be removed "
+        "in HA Core 2026.12.0. Use TemperatureDeltaConverter.convert instead"
+    ) in caplog.text
 
 
 @pytest.mark.parametrize(