diff --git a/pkgs/development/python-modules/vtherm-api/default.nix b/pkgs/development/python-modules/vtherm-api/default.nix
new file mode 100644
index 000000000000..37abc93a5435
--- /dev/null
+++ b/pkgs/development/python-modules/vtherm-api/default.nix
@@ -0,0 +1,44 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+  home-assistant,
+  pythonOlder,
+  pytest-asyncio,
+  pytestCheckHook,
+  setuptools,
+}:
+
+buildPythonPackage (finalAttrs: {
+  pname = "vtherm-api";
+  version = "0.3.0";
+  pyproject = true;
+
+  disabled = pythonOlder "3.14";
+
+  src = fetchFromGitHub {
+    owner = "jmcollin78";
+    repo = "vtherm_api";
+    tag = finalAttrs.version;
+    hash = "sha256-8YE9+Y+R6TvBKssRPvDLSdVzonDawWgg01Ngk94eMzM=";
+  };
+
+  build-system = [ setuptools ];
+
+  dependencies = [ home-assistant ];
+
+  nativeCheckInputs = [
+    pytest-asyncio
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [ "vtherm_api" ];
+
+  meta = {
+    changelog = "https://github.com/jmcollin78/vtherm_api/releases/tag/${finalAttrs.version}";
+    description = "API for Versatile Thermostat Home Assistant integrations";
+    homepage = "https://github.com/jmcollin78/vtherm_api";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ geri1701 ];
+  };
+})
diff --git a/pkgs/servers/home-assistant/custom-components/versatile_thermostat/package.nix b/pkgs/servers/home-assistant/custom-components/versatile_thermostat/package.nix
index 4daa7cee951f..028596f033f1 100644
--- a/pkgs/servers/home-assistant/custom-components/versatile_thermostat/package.nix
+++ b/pkgs/servers/home-assistant/custom-components/versatile_thermostat/package.nix
@@ -4,24 +4,26 @@
   lib,
   numpy,
   scipy,
+  vtherm-api,
   gitUpdater,
 }:
 
 buildHomeAssistantComponent rec {
   owner = "jmcollin78";
   domain = "versatile_thermostat";
-  version = "9.3.3";
+  version = "10.0.2";
 
   src = fetchFromGitHub {
     inherit owner;
     repo = domain;
     tag = version;
-    hash = "sha256-TiaJFFx3nEUYHVB5Ka71MaP8pngcPSdHxt920NSCQ8c=";
+    hash = "sha256-WnhOsvBhIyumWkEiX2Id2fz4GQQTZxBOLPtR6zHqsXw=";
   };
 
   dependencies = [
     numpy
     scipy
+    vtherm-api
   ];
 
   passthru.updateScript = gitUpdater { ignoredVersions = "(Alpha|Beta|alpha|beta).*"; };
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 409ac7becf33..10b615e269ee 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -21810,6 +21810,8 @@ self: super: with self; {
 
   vt-py = callPackage ../development/python-modules/vt-py { };
 
+  vtherm-api = callPackage ../development/python-modules/vtherm-api { };
+
   vtjp = callPackage ../development/python-modules/vtjp { };
 
   vtk = toPythonModule (