diff --git a/CHANGELOG.md b/CHANGELOG.md
index a234b885..9ca77fdc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Global Home Assistant connection status indicator in the bottom bar, always visible: green when connected, red when disconnected or not configured. Clicking it opens a popover with the per-service status detail and a button to jump straight to the Home Assistant settings (the External Services page lands pre-filtered on the relevant adapter) (#20).
 - Unit-of-measure fields in configuration forms are now selected through a segmented control (e.g. `W` / `kW` / `MW`, `Wh` / `kWh` / `MWh`, `GH/s` / `TH/s` / `PH/s`) instead of a free-text input, preventing inconsistent or invalid values. The available options are inferred automatically from each field, so the control applies to every configuration form (#18).
 - Home Assistant entity fields now show a selectable entity-domain prefix (e.g. `sensor.`, `switch.`) as a dropdown next to the input, so the user only types the entity object id. The domain defaults to the one derived from the field's value/default/name and can be overridden, with the prefix now enabled on Forecast Provider and Miner Controller forms too (handling controllers that mix `switch.` and `sensor.` entities) (#39).
 
diff --git a/frontend/src/components/BottomBar.vue b/frontend/src/components/BottomBar.vue
index e4dde185..5204661f 100644
--- a/frontend/src/components/BottomBar.vue
+++ b/frontend/src/components/BottomBar.vue
@@ -1,25 +1,142 @@
 <script setup lang="ts">
-import { onMounted } from "vue";
+import { computed, onMounted, onBeforeUnmount, ref, nextTick } from "vue";
+import { useRouter } from "vue-router";
 import { useExternalServiceStore } from "../core/stores/externalServiceStore";
 import { useAppStore } from "../core/stores/appStore";
 import type { ExternalServiceStatusType } from "../core/models/externalService";
+import { PhHouse, PhArrowRight } from "@phosphor-icons/vue";
+
+type IndicatorStatus = ExternalServiceStatusType | "not_configured" | "unknown";
 
 const store = useExternalServiceStore();
 const appStore = useAppStore();
+const router = useRouter();
+
+const HA_ADAPTER_PREFIX = "home_assistant";
 
-const badgeClass: Record<ExternalServiceStatusType, string> = {
+const badgeClass: Record<IndicatorStatus, string> = {
   connected: "border-success text-success bg-success/10",
   disconnected: "border-error text-error bg-error/10",
   unauthorized: "border-warning text-warning bg-warning/10",
+  not_configured: "border-error text-error bg-error/10",
+  unknown: "border-error text-error bg-error/10",
 };
 
-const statusClass: Record<ExternalServiceStatusType, string> = {
+const statusClass: Record<IndicatorStatus, string> = {
   connected: "status-success",
   disconnected: "status-error",
   unauthorized: "status-warning",
+  not_configured: "status-error",
+  unknown: "status-error",
 };
 
+const statusLabel: Record<IndicatorStatus, string> = {
+  connected: "Connected",
+  disconnected: "Disconnected",
+  unauthorized: "Unauthorized",
+  not_configured: "Not configured",
+  unknown: "Unknown",
+};
+
+// Home Assistant services (api and/or mqtt adapters)
+const haServices = computed(() =>
+  store.externalServices.filter((s) => s.adapter_type.startsWith(HA_ADAPTER_PREFIX))
+);
+
+interface HaServiceStatus {
+  name: string;
+  adapter_type: string;
+  status: IndicatorStatus;
+  error_message?: string;
+}
+
+// Aggregated HA indicator: always present, even when HA is not configured.
+const haIndicator = computed<{ status: IndicatorStatus; services: HaServiceStatus[] }>(() => {
+  const services: HaServiceStatus[] = haServices.value.map((s) => {
+    const st = s.id ? store.serviceStatuses.get(String(s.id)) : undefined;
+    return {
+      name: s.name,
+      adapter_type: s.adapter_type,
+      status: st?.status ?? "unknown",
+      error_message: st?.error_message,
+    };
+  });
+
+  let status: IndicatorStatus;
+  if (services.length === 0) {
+    status = "not_configured";
+  } else if (services.every((s) => s.status === "connected")) {
+    status = "connected";
+  } else if (services.some((s) => s.status === "unauthorized")) {
+    status = "unauthorized";
+  } else {
+    status = "disconnected";
+  }
+
+  return { status, services };
+});
+
+// Non-HA service badges (kept as before).
+const otherStatuses = computed(() => {
+  const haIds = new Set(haServices.value.map((s) => String(s.id)));
+  return [...store.serviceStatuses.entries()]
+    .filter(([id]) => !haIds.has(id))
+    .map(([, status]) => status);
+});
+
+// --- Popover (teleported to body so the bottom bar's overflow does not clip it) ---
+const showPopover = ref(false);
+const triggerRef = ref<HTMLElement | null>(null);
+const popoverRef = ref<HTMLElement | null>(null);
+const popoverStyle = ref<Record<string, string>>({});
+
+function positionPopover() {
+  const el = triggerRef.value;
+  if (!el) return;
+  const rect = el.getBoundingClientRect();
+  popoverStyle.value = {
+    position: "fixed",
+    bottom: `${window.innerHeight - rect.top + 8}px`,
+    right: `${Math.max(window.innerWidth - rect.right, 8)}px`,
+  };
+}
+
+async function togglePopover() {
+  if (showPopover.value) {
+    showPopover.value = false;
+    return;
+  }
+  positionPopover();
+  showPopover.value = true;
+  await nextTick();
+  positionPopover();
+}
+
+function handleOutside(event: MouseEvent) {
+  if (!showPopover.value) return;
+  const target = event.target as Node;
+  if (triggerRef.value?.contains(target) || popoverRef.value?.contains(target)) return;
+  showPopover.value = false;
+}
+
+function handleKeydown(event: KeyboardEvent) {
+  if (event.key === "Escape") showPopover.value = false;
+}
+
+function openHaSettings() {
+  showPopover.value = false;
+  const adapter = haServices.value[0]?.adapter_type;
+  router.push({
+    name: "settings.externalServices",
+    query: adapter ? { adapter } : {},
+  });
+}
+
 onMounted(async () => {
+  document.addEventListener("click", handleOutside, true);
+  document.addEventListener("keydown", handleKeydown);
+  window.addEventListener("resize", positionPopover);
+
   if (store.externalServices.length === 0) {
     await store.loadExternalServices();
   }
@@ -29,27 +146,49 @@ onMounted(async () => {
     appStore.fetchVersion();
   }
 });
+
+onBeforeUnmount(() => {
+  document.removeEventListener("click", handleOutside, true);
+  document.removeEventListener("keydown", handleKeydown);
+  window.removeEventListener("resize", positionPopover);
+});
 </script>
 
 <template>
   <footer
     class="h-8 flex-shrink-0 flex items-center justify-end gap-2 px-4 border-t border-base-300/40 bg-base-100 overflow-hidden"
   >
-    <template v-if="store.serviceStatuses.size > 0">
-      <span
-        v-for="[, status] in store.serviceStatuses"
-        :key="status.name"
-        class="inline-flex items-center gap-1.5 px-2 py-0.5 rounded border text-xs"
-        :class="badgeClass[status.status] ?? 'border-base-300 text-base-300'"
-        :title="status.error_message ?? status.status"
-      >
-        <div class="inline-grid *:[grid-area:1/1]">
-          <div v-if="status.status === 'connected'" class="status" :class="statusClass[status.status] + ' animate-ping'"></div>
-          <div class="status" :class="statusClass[status.status]"></div>
-        </div>
-        {{ status.name }}
-      </span>
-    </template>
+    <!-- Other external service statuses -->
+    <span
+      v-for="status in otherStatuses"
+      :key="status.name"
+      class="inline-flex items-center gap-1.5 px-2 py-0.5 rounded border text-xs"
+      :class="badgeClass[status.status] ?? 'border-base-300 text-base-300'"
+      :title="status.error_message ?? status.status"
+    >
+      <div class="inline-grid *:[grid-area:1/1]">
+        <div v-if="status.status === 'connected'" class="status" :class="statusClass[status.status] + ' animate-ping'"></div>
+        <div class="status" :class="statusClass[status.status]"></div>
+      </div>
+      {{ status.name }}
+    </span>
+
+    <!-- Home Assistant connection indicator (always visible) -->
+    <button
+      ref="triggerRef"
+      type="button"
+      class="inline-flex items-center gap-1.5 px-2 py-0.5 rounded border text-xs cursor-pointer"
+      :class="badgeClass[haIndicator.status]"
+      :title="`Home Assistant: ${statusLabel[haIndicator.status]}`"
+      @click="togglePopover"
+    >
+      <div class="inline-grid *:[grid-area:1/1]">
+        <div v-if="haIndicator.status === 'connected'" class="status" :class="statusClass[haIndicator.status] + ' animate-ping'"></div>
+        <div class="status" :class="statusClass[haIndicator.status]"></div>
+      </div>
+      <PhHouse :size="14" weight="bold" />
+      Home Assistant
+    </button>
 
     <span
       class="inline-flex items-center px-2 py-0.5 rounded border border-primary/40 text-primary/70 bg-primary/10 text-xs"
@@ -59,6 +198,59 @@ onMounted(async () => {
       <template v-else>v?</template>
     </span>
   </footer>
+
+  <!-- Teleported popover -->
+  <Teleport to="body">
+    <Transition name="popover-fade">
+      <div
+        v-if="showPopover"
+        ref="popoverRef"
+        class="z-[100] w-72 rounded-box border border-base-300/40 bg-base-200 shadow-lg p-3"
+        :style="popoverStyle"
+      >
+        <div class="flex items-center gap-2 mb-2">
+          <PhHouse :size="16" weight="bold" class="text-sky-400" />
+          <span class="text-sm font-semibold">Home Assistant</span>
+        </div>
+
+        <p v-if="haIndicator.status === 'not_configured'" class="text-xs text-base-content/60 mb-3">
+          No Home Assistant service is configured yet.
+        </p>
+
+        <ul v-else class="space-y-2 mb-3">
+          <li
+            v-for="svc in haIndicator.services"
+            :key="svc.name"
+            class="flex items-start gap-2 text-xs"
+          >
+            <div class="inline-grid *:[grid-area:1/1] mt-0.5">
+              <div class="status" :class="statusClass[svc.status]"></div>
+            </div>
+            <div class="min-w-0">
+              <div class="font-medium truncate">{{ svc.name }}</div>
+              <div class="text-base-content/60">{{ statusLabel[svc.status] }}</div>
+              <div v-if="svc.error_message" class="text-error/80 break-words">{{ svc.error_message }}</div>
+            </div>
+          </li>
+        </ul>
+
+        <button class="btn btn-primary btn-sm w-full gap-2" @click="openHaSettings">
+          Open Home Assistant settings
+          <PhArrowRight :size="14" weight="bold" />
+        </button>
+      </div>
+    </Transition>
+  </Teleport>
 </template>
 
-<style scoped></style>
+<style scoped>
+.popover-fade-enter-active,
+.popover-fade-leave-active {
+  transition: opacity 0.15s ease, transform 0.15s ease;
+}
+.popover-fade-enter-from,
+.popover-fade-leave-to {
+  opacity: 0;
+  transform: translateY(4px);
+}
+</style>
diff --git a/frontend/src/views/settings/ExternalServicesSettingsView.vue b/frontend/src/views/settings/ExternalServicesSettingsView.vue
index a7ecfd12..9db18a79 100644
--- a/frontend/src/views/settings/ExternalServicesSettingsView.vue
+++ b/frontend/src/views/settings/ExternalServicesSettingsView.vue
@@ -1,5 +1,6 @@
 <script setup lang="ts">
 import { computed, onMounted, ref } from "vue";
+import { useRoute } from "vue-router";
 import { useExternalServiceStore } from "../../core/stores/externalServiceStore";
 import ExternalServiceCard from "../../components/externalServices/ExternalServiceCard.vue";
 import ExternalServiceFormModal from "../../components/externalServices/ExternalServiceFormModal.vue";
@@ -16,6 +17,7 @@ import {
 } from "@phosphor-icons/vue";
 
 const externalServiceStore = useExternalServiceStore();
+const route = useRoute();
 
 // Modal state
 const showModal = ref(false);
@@ -79,6 +81,11 @@ const stats = computed(() => {
 });
 
 onMounted(() => {
+  const adapterQuery = route.query.adapter;
+  if (typeof adapterQuery === "string" && adapterQuery) {
+    selectedAdapterFilter.value = adapterQuery;
+  }
+
   externalServiceStore.loadExternalServices().then(() => {
     externalServiceStore.loadServicesStatus();
   });
@@ -347,7 +354,7 @@ function getFilterCount(adapterType: string): number {
   .stat-value {
     font-size: 1.25rem;
   }
-  
+
   .stat-type-count {
     font-size: 0.875rem;
   }