diff --git a/Hemera/Entities/Climate/UI/ClimateCardViewModel.swift b/Hemera/Entities/Climate/UI/ClimateCardViewModel.swift
index 5322d93..1add9b7 100644
--- a/Hemera/Entities/Climate/UI/ClimateCardViewModel.swift
+++ b/Hemera/Entities/Climate/UI/ClimateCardViewModel.swift
@@ -200,6 +200,7 @@ final class ClimateCardViewModel: Identifiable {
 
     func togglePower() {
         guard climate.isAvailable else { return }
+        actionTask?.cancel()
         if climate.state == .off {
             actionTask = Task { await controller.turnOnClimate(id) }
         } else {
@@ -209,6 +210,7 @@ final class ClimateCardViewModel: Identifiable {
 
     func setHVACMode(_ mode: ClimateEntity.HVACMode) {
         guard climate.isAvailable else { return }
+        actionTask?.cancel()
         actionTask = Task { await controller.setHVACMode(id, mode: mode.rawValue) }
     }
 
@@ -217,6 +219,7 @@ final class ClimateCardViewModel: Identifiable {
         resetPending()
         pendingTargetTemp = temperature
         cooldown.commit()
+        actionTask?.cancel()
         actionTask = Task { await controller.setTemperature(id, temperature: temperature) }
     }
 
@@ -226,6 +229,7 @@ final class ClimateCardViewModel: Identifiable {
         pendingTargetTempLow = low
         pendingTargetTempHigh = high
         cooldown.commit()
+        actionTask?.cancel()
         actionTask = Task { await controller.setTemperatureRange(id, low: low, high: high) }
     }
 
@@ -243,21 +247,25 @@ final class ClimateCardViewModel: Identifiable {
 
     func setFanMode(_ mode: String) {
         guard climate.isAvailable else { return }
+        actionTask?.cancel()
         actionTask = Task { await controller.setFanMode(id, mode: mode) }
     }
 
     func setSwingMode(_ mode: String) {
         guard climate.isAvailable else { return }
+        actionTask?.cancel()
         actionTask = Task { await controller.setSwingMode(id, mode: mode) }
     }
 
     func setPresetMode(_ mode: String) {
         guard climate.isAvailable else { return }
+        actionTask?.cancel()
         actionTask = Task { await controller.setPresetMode(id, mode: mode) }
     }
 
     func setHumidity(_ humidity: Double) {
         guard climate.isAvailable else { return }
+        actionTask?.cancel()
         actionTask = Task { await controller.setHumidity(id, humidity: humidity) }
     }
 
diff --git a/Hemera/Entities/Cover/UI/CoverCardViewModel.swift b/Hemera/Entities/Cover/UI/CoverCardViewModel.swift
index a596f51..2faa555 100644
--- a/Hemera/Entities/Cover/UI/CoverCardViewModel.swift
+++ b/Hemera/Entities/Cover/UI/CoverCardViewModel.swift
@@ -134,6 +134,7 @@ final class CoverCardViewModel: Identifiable {
 
     func setPosition(to position: Int) {
         guard cover.isAvailable else { return }
+        actionTask?.cancel()
         pendingPosition = position
         cooldown.commit()
         actionTask = Task {
@@ -171,6 +172,7 @@ final class CoverCardViewModel: Identifiable {
 
     func open() {
         guard cover.isAvailable else { return }
+        actionTask?.cancel()
         actionTask = Task {
             await controller.openCover(id)
         }
@@ -178,6 +180,7 @@ final class CoverCardViewModel: Identifiable {
 
     func close() {
         guard cover.isAvailable else { return }
+        actionTask?.cancel()
         actionTask = Task {
             await controller.closeCover(id)
         }
@@ -185,12 +188,14 @@ final class CoverCardViewModel: Identifiable {
 
     func stop() {
         guard cover.isAvailable else { return }
+        actionTask?.cancel()
         actionTask = Task {
             await controller.stopCover(id)
         }
     }
 
     private func toggle() {
+        actionTask?.cancel()
         actionTask = Task {
             await controller.toggleCover(id)
         }
diff --git a/HemeraTests/Entities/ClimateCardViewModelTests.swift b/HemeraTests/Entities/ClimateCardViewModelTests.swift
index 446d1db..125f001 100644
--- a/HemeraTests/Entities/ClimateCardViewModelTests.swift
+++ b/HemeraTests/Entities/ClimateCardViewModelTests.swift
@@ -282,6 +282,29 @@ struct ClimateCardViewModelTests {
         #expect(spy.setTemperatureCalls.isEmpty)
     }
 
+    // MARK: - Action Cancellation
+
+    /**
+     A second action must cancel the in-flight one. Otherwise the demo controller's
+     post-sleep `guard !Task.isCancelled` never fires and the still-running earlier
+     action overwrites the state the newer action just applied.
+     */
+    @Test func setTemperature_whileActionInFlight_cancelsPriorAction() async {
+        let controller = SlowClimateControlling()
+        let vm = makeViewModel(state: .heat, controller: controller)
+
+        vm.setTemperature(20)
+        let firstTask = vm.actionTask
+        vm.setHVACMode(.cool)
+
+        await firstTask?.value
+        await vm.actionTask?.value
+
+        #expect(firstTask?.isCancelled == true)
+        #expect(controller.didCompleteSetTemperature == false)
+        #expect(controller.setHVACModeCalls == ["cool"])
+    }
+
     // MARK: - Available HVAC Modes
 
     @Test func availableHVACModes_parsesFromRaw() {
@@ -408,3 +431,31 @@ private final class SpyClimateControlling: ClimateControlling {
         turnOffCalls.append(id)
     }
 }
+
+/**
+ Mirrors the demo controller: `setTemperature` simulates a delayed apply, then only
+ completes if its Task was not cancelled — the same `guard !Task.isCancelled` the bug hinges on.
+ */
+@MainActor
+private final class SlowClimateControlling: ClimateControlling {
+    var didCompleteSetTemperature = false
+    var setHVACModeCalls: [String] = []
+
+    func setHVACMode(_ id: String, mode: String) async {
+        setHVACModeCalls.append(mode)
+    }
+
+    func setTemperature(_ id: String, temperature: Double) async {
+        try? await Task.sleep(for: .seconds(2))
+        guard !Task.isCancelled else { return }
+        didCompleteSetTemperature = true
+    }
+
+    func setTemperatureRange(_ id: String, low: Double, high: Double) async {}
+    func setFanMode(_ id: String, mode: String) async {}
+    func setSwingMode(_ id: String, mode: String) async {}
+    func setPresetMode(_ id: String, mode: String) async {}
+    func setHumidity(_ id: String, humidity: Double) async {}
+    func turnOnClimate(_ id: String) async {}
+    func turnOffClimate(_ id: String) async {}
+}
diff --git a/HemeraTests/Entities/CoverCardViewModelTests.swift b/HemeraTests/Entities/CoverCardViewModelTests.swift
index b3d96b5..6f10f6e 100644
--- a/HemeraTests/Entities/CoverCardViewModelTests.swift
+++ b/HemeraTests/Entities/CoverCardViewModelTests.swift
@@ -131,6 +131,82 @@ struct CoverCardViewModelTests {
         #expect(spy.openedIds.isEmpty)
     }
 
+    // MARK: - Action Cancellation
+
+    /**
+     Stopping mid-open must cancel the in-flight open Task. Otherwise the demo
+     controller's post-sleep `guard !Task.isCancelled` never fires and the still-running
+     open overwrites the state Stop just set (cover snaps fully open ~2s after Stop).
+     */
+    @Test
+    func stop_duringOpen_cancelsInFlightOpenSoItDoesNotOverwriteState() async {
+        let controller = SlowCoverControlling()
+        let vm = makeViewModel(features: [.open, .stop], controller: controller)
+
+        vm.open()
+        let openTask = vm.actionTask
+        vm.stop()
+
+        await openTask?.value
+        await vm.actionTask?.value
+
+        #expect(openTask?.isCancelled == true)
+        #expect(controller.didCompleteOpen == false)
+        #expect(controller.stoppedIds == ["cover.test"])
+    }
+
+    @Test
+    func close_duringOpen_cancelsInFlightOpen() async {
+        let controller = SlowCoverControlling()
+        let vm = makeViewModel(features: [.open, .close], controller: controller)
+
+        vm.open()
+        let openTask = vm.actionTask
+        vm.close()
+
+        await openTask?.value
+        await vm.actionTask?.value
+
+        #expect(openTask?.isCancelled == true)
+        #expect(controller.didCompleteOpen == false)
+        #expect(controller.closedIds == ["cover.test"])
+    }
+
+    @Test
+    func setPosition_duringOpen_cancelsInFlightOpen() async {
+        let controller = SlowCoverControlling()
+        let vm = makeViewModel(features: [.open, .setPosition], controller: controller)
+
+        vm.open()
+        let openTask = vm.actionTask
+        vm.setPosition(to: 50)
+
+        await openTask?.value
+        await vm.actionTask?.value
+
+        #expect(openTask?.isCancelled == true)
+        #expect(controller.didCompleteOpen == false)
+        #expect(controller.positionCalls == [50])
+    }
+
+    @Test
+    func toggleViaIconTapped_duringOpen_cancelsInFlightOpen() async {
+        let controller = SlowCoverControlling()
+        // No .open feature → iconTapped's .closed case falls back to toggle().
+        let vm = makeViewModel(state: .closed, features: [], controller: controller)
+
+        vm.open()
+        let openTask = vm.actionTask
+        vm.iconTapped()
+
+        await openTask?.value
+        await vm.actionTask?.value
+
+        #expect(openTask?.isCancelled == true)
+        #expect(controller.didCompleteOpen == false)
+        #expect(controller.toggledIds == ["cover.test"])
+    }
+
     // MARK: - Simple State Description
 
     @Test
@@ -317,3 +393,38 @@ private final class SpyCoverControlling: CoverControlling {
         toggledIds.append(id)
     }
 }
+
+/**
+ Mirrors the demo controller: `openCover` simulates travel, then only completes if
+ its Task was not cancelled — the same `guard !Task.isCancelled` the real bug hinges on.
+ */
+@MainActor
+private final class SlowCoverControlling: CoverControlling {
+    var didCompleteOpen = false
+    var stoppedIds: [String] = []
+    var positionCalls: [Int] = []
+    var closedIds: [String] = []
+    var toggledIds: [String] = []
+
+    func setPosition(of id: String, to position: Int) async {
+        positionCalls.append(position)
+    }
+
+    func openCover(_ id: String) async {
+        try? await Task.sleep(for: .seconds(2))
+        guard !Task.isCancelled else { return }
+        didCompleteOpen = true
+    }
+
+    func closeCover(_ id: String) async {
+        closedIds.append(id)
+    }
+
+    func stopCover(_ id: String) async {
+        stoppedIds.append(id)
+    }
+
+    func toggleCover(_ id: String) async {
+        toggledIds.append(id)
+    }
+}