diff --git a/.gitignore b/.gitignore
index 4ac39a19d..39d282e9a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -69,5 +69,7 @@ site_scons/site_tools/mfprogram/*.pyc
 site_scons/site_tools/gch/*.pyc
 .vscode/
 .vs/
+# Intentional merge conflict (meson stuff)
+subprojects/
 
 screenshot_*
diff --git a/src/gui/game/GameController.cpp b/src/gui/game/GameController.cpp
index 77c515206..3db2237db 100644
--- a/src/gui/game/GameController.cpp
+++ b/src/gui/game/GameController.cpp
@@ -885,6 +885,11 @@ bool GameController::GetAHeatEnable()
 	return gameModel->GetAHeatEnable();
 }
 
+void GameController::ResetAHeat()
+{
+	gameModel->ResetAHeat();
+}
+
 void GameController::ToggleNewtonianGravity()
 {
 	gameModel->SetNewtonianGravity(!gameModel->GetNewtonianGrvity());
diff --git a/src/gui/game/GameController.h b/src/gui/game/GameController.h
index 3b62106ab..67496c2c2 100644
--- a/src/gui/game/GameController.h
+++ b/src/gui/game/GameController.h
@@ -161,6 +161,7 @@ public:
 	void SwitchAir();
 	void ToggleAHeat();
 	bool GetAHeatEnable();
+	void ResetAHeat();
 	void ToggleNewtonianGravity();
 
 	bool LoadClipboard();
diff --git a/src/gui/game/GameModel.cpp b/src/gui/game/GameModel.cpp
index ac8d58c13..e3686af24 100644
--- a/src/gui/game/GameModel.cpp
+++ b/src/gui/game/GameModel.cpp
@@ -1018,6 +1018,11 @@ bool GameModel::GetAHeatEnable()
 	return sim->aheat_enable;
 }
 
+void GameModel::ResetAHeat()
+{
+	sim->air->ClearAirH();
+}
+
 void GameModel::SetNewtonianGravity(bool newtonainGravity)
 {
     if (newtonainGravity)
diff --git a/src/gui/game/GameModel.h b/src/gui/game/GameModel.h
index 9569d0d01..66c09c798 100644
--- a/src/gui/game/GameModel.h
+++ b/src/gui/game/GameModel.h
@@ -171,16 +171,17 @@ public:
 	void SetSaveFile(SaveFile * newSave, bool invertIncludePressure);
 	void AddObserver(GameView * observer);
 
-	bool GetPaused();
 	void SetPaused(bool pauseState);
-	bool GetDecoration();
+	bool GetPaused();
 	void SetDecoration(bool decorationState);
-	bool GetAHeatEnable();
+	bool GetDecoration();
 	void SetAHeatEnable(bool aHeat);
-	bool GetNewtonianGrvity();
+	bool GetAHeatEnable();
+	void ResetAHeat();
 	void SetNewtonianGravity(bool newtonainGravity);
-	bool GetGravityGrid();
+	bool GetNewtonianGrvity();
 	void ShowGravityGrid(bool showGrid);
+	bool GetGravityGrid();
 	void ClearSimulation();
 	std::vector<Menu*> GetMenuList();
 	std::vector<QuickOption*> GetQuickOptions();
diff --git a/src/gui/game/GameView.cpp b/src/gui/game/GameView.cpp
index 7f21f10f7..4b815d492 100644
--- a/src/gui/game/GameView.cpp
+++ b/src/gui/game/GameView.cpp
@@ -1387,7 +1387,10 @@ void GameView::OnKeyPress(int key, int scan, bool repeat, bool shift, bool ctrl,
 		ui::Engine::Ref().ConfirmExit();
 		break;
 	case SDL_SCANCODE_U:
-		c->ToggleAHeat();
+		if (ctrl)
+			c->ResetAHeat();
+		else
+			c->ToggleAHeat();
 		break;
 	case SDL_SCANCODE_N:
 		c->ToggleNewtonianGravity();