diff --git a/src/evohomeasync2/schema/config.py b/src/evohomeasync2/schema/config.py
index d1dc7efe..240aee66 100644
--- a/src/evohomeasync2/schema/config.py
+++ b/src/evohomeasync2/schema/config.py
@@ -190,7 +190,7 @@ def _factory_zone(fnc: Callable[[str], str] = do_nothing) -> vol.Schema:
 
     SCH_FAN_MODE: Final = vol.Schema(  # noqa: F841
         {
-            vol.Required(SZ_FAN_MODE): vol.In([m.value for m in FanMode]),
+            vol.Required(fnc(SZ_FAN_MODE)): vol.In([m.value for m in FanMode]),
         },
         extra=vol.PREVENT_EXTRA,
     )
diff --git a/tests/tests/helpers.py b/tests/tests/helpers.py
index efd1af48..65744f27 100644
--- a/tests/tests/helpers.py
+++ b/tests/tests/helpers.py
@@ -18,7 +18,7 @@ def test_schema(folder: Path, schema: vol.Schema, file_name: str) -> None:
         pytest.skip(f"No {file_name} in: {folder.name}")
 
     with open(Path(folder).joinpath(file_name)) as f:
-        data: dict = json.load(f)
+        data: dict = json.load(f)  # is camelCase, as per vendor's schema
 
     _ = schema(data)
 
diff --git a/tests/tests/test_schedules.py b/tests/tests/test_schedules.py
index fe34e809..297e0b3a 100644
--- a/tests/tests/test_schedules.py
+++ b/tests/tests/test_schedules.py
@@ -25,7 +25,7 @@
 def _test_schedule_schema(file_name: str, schema: vol.Schema) -> dict:
     def read_dict_from_file(file_name: str) -> dict:
         with open(WORK_DIR.joinpath(file_name)) as f:
-            data: dict = json.load(f)
+            data: dict = json.load(f)  # is camelCase, as per vendor's schema
         return data
 
     return schema(read_dict_from_file(file_name))  # type: ignore[no-any-return]
diff --git a/tests/tests/test_schemas_0.py b/tests/tests/test_schemas_0.py
index a4cba271..b6cb0349 100644
--- a/tests/tests/test_schemas_0.py
+++ b/tests/tests/test_schemas_0.py
@@ -25,6 +25,7 @@
     SZ_TEMPERATURE_CONTROL_SYSTEMS,
     SZ_TIME_ZONE,
 )
+from evohomeasync2.schema.helpers import snake_to_camel
 
 from .helpers import TEST_DIR
 
@@ -96,11 +97,13 @@ def test_config_schemas(folder: Path) -> None:
         pytest.skip(f"No {CONFIG_FILE_NAME} in: {folder.name}")
 
     with open(Path(folder).joinpath(CONFIG_FILE_NAME)) as f:
-        config: dict = json.load(f)
+        config: dict = json.load(f)  # is camelCase, as per vendor's schema
 
-    _ = SCH_TIME_ZONE(config[SZ_LOCATION_INFO][SZ_TIME_ZONE])
-    for gwy_config in config[SZ_GATEWAYS]:
-        for tcs_config in gwy_config[SZ_TEMPERATURE_CONTROL_SYSTEMS]:
+    _ = SCH_TIME_ZONE(
+        config[snake_to_camel(SZ_LOCATION_INFO)][snake_to_camel(SZ_TIME_ZONE)]
+    )
+    for gwy_config in config[snake_to_camel(SZ_GATEWAYS)]:
+        for tcs_config in gwy_config[snake_to_camel(SZ_TEMPERATURE_CONTROL_SYSTEMS)]:
             _ = SCH_TCS_CONFIG(tcs_config)
 
 
@@ -111,6 +114,6 @@ def test_status_schemas(folder: Path) -> None:
         pytest.skip(f"No {STATUS_FILE_NAME} in: {folder.name}")
 
     with open(Path(folder).joinpath(STATUS_FILE_NAME)) as f:
-        status: dict = json.load(f)
+        status: dict = json.load(f)  # is camelCase, as per vendor's schema
 
     _ = SCH_LOCN_STATUS(status)
diff --git a/tests/tests/test_schemas_1.py b/tests/tests/test_schemas_1.py
index 19cb8158..d090e140 100644
--- a/tests/tests/test_schemas_1.py
+++ b/tests/tests/test_schemas_1.py
@@ -9,7 +9,7 @@
 import pytest
 
 from evohomeasync2 import Location
-from evohomeasync2.schema import SCH_LOCN_STATUS
+from evohomeasync2.schema import SCH_LOCN_STATUS, convert_keys_to_snake_case
 from evohomeasync2.schema.config import SCH_TCS_CONFIG, SCH_TIME_ZONE
 from evohomeasync2.schema.const import (
     SZ_GATEWAYS,
@@ -17,7 +17,7 @@
     SZ_TEMPERATURE_CONTROL_SYSTEMS,
     SZ_TIME_ZONE,
 )
-from evohomeasync2.session import convert_keys_to_snake_case
+from evohomeasync2.schema.helpers import snake_to_camel
 
 from .conftest import ClientStub
 from .helpers import TEST_DIR
@@ -49,13 +49,14 @@ def test_config_refresh(folder: Path) -> None:
         pytest.skip(f"No {STATUS_FILE_NAME} in: {folder.name}")
 
     with open(Path(folder).joinpath(CONFIG_FILE_NAME)) as f:
-        config: dict = convert_keys_to_snake_case(json.load(f))
+        config: dict = json.load(f)  # is camelCase, as per vendor's schema
 
     with open(Path(folder).joinpath(STATUS_FILE_NAME)) as f:
-        status: dict = convert_keys_to_snake_case(json.load(f))
+        status: dict = json.load(f)  # is camelCase, as per vendor's schema
 
-    loc = Location(ClientStub(), config)
-    loc._update_status(status)
+    # for this, we need snake_case keys
+    loc = Location(ClientStub(), convert_keys_to_snake_case(config))
+    loc._update_status(convert_keys_to_snake_case(status))
 
 
 def test_config_schemas(folder: Path) -> None:
@@ -65,11 +66,14 @@ def test_config_schemas(folder: Path) -> None:
         pytest.skip(f"No {CONFIG_FILE_NAME} in: {folder.name}")
 
     with open(Path(folder).joinpath(CONFIG_FILE_NAME)) as f:
-        config: dict = json.load(f)
+        config: dict = json.load(f)  # is camelCase, as per vendor's schema
 
-    _ = SCH_TIME_ZONE(config[SZ_LOCATION_INFO][SZ_TIME_ZONE])
-    for gwy_config in config[SZ_GATEWAYS]:
-        for tcs_config in gwy_config[SZ_TEMPERATURE_CONTROL_SYSTEMS]:
+    _ = SCH_TIME_ZONE(
+        config[snake_to_camel(SZ_LOCATION_INFO)][snake_to_camel(SZ_TIME_ZONE)]
+    )
+
+    for gwy_config in (config[snake_to_camel(SZ_GATEWAYS)]):
+        for tcs_config in gwy_config[snake_to_camel(SZ_TEMPERATURE_CONTROL_SYSTEMS)]:
             _ = SCH_TCS_CONFIG(tcs_config)
 
 
@@ -80,6 +84,6 @@ def test_status_schemas(folder: Path) -> None:
         pytest.skip(f"No {STATUS_FILE_NAME} in: {folder.name}")
 
     with open(Path(folder).joinpath(STATUS_FILE_NAME)) as f:
-        status: dict = json.load(f)
+        status: dict = json.load(f)  # is camelCase, as per vendor's schema
 
     _ = SCH_LOCN_STATUS(status)