diff --git a/src/graphics/Renderer.cpp b/src/graphics/Renderer.cpp
index 3dfb293da..a975cc1df 100644
--- a/src/graphics/Renderer.cpp
+++ b/src/graphics/Renderer.cpp
@@ -13,6 +13,7 @@
 #include "simulation/gravity/Gravity.h"
 #include "simulation/orbitalparts.h"
 #include <cmath>
+#include <algorithm>
 
 void Renderer::RenderBackground()
 {
@@ -264,7 +265,7 @@ void Renderer::render_parts()
 					BlendPixel({ nx, ny }, 0x646464_rgb .WithAlpha(80));
 			}
 	}
-	foundParticles = 0;
+	stats.foundParticles = 0;
 	for(i = 0; i<=sim->parts.lastActiveIndex; i++) {
 		if (sim->parts[i].type && sim->parts[i].type >= 0 && sim->parts[i].type < PT_NUM) {
 			t = sim->parts[i].type;
@@ -360,10 +361,8 @@ void Renderer::render_parts()
 				//Alter colour based on display mode
 				if(colorMode & COLOUR_HEAT)
 				{
-					constexpr float min_temp = MIN_TEMP;
-					constexpr float max_temp = MAX_TEMP;
 					firea = 255;
-					RGB color = heatTableAt(int((sim->parts[i].temp - min_temp) / (max_temp - min_temp) * 1024));
+					RGB color = heatTableAt(int((sim->parts[i].temp - stats.hdispLimitMin) / (stats.hdispLimitMax - stats.hdispLimitMin) * 1024));
 					firer = colr = color.Red;
 					fireg = colg = color.Green;
 					fireb = colb = color.Blue;
@@ -485,7 +484,7 @@ void Renderer::render_parts()
 					{
 						colr = firer = 255;
 						colg = fireg = colb = fireb = 0;
-						foundParticles++;
+						stats.foundParticles++;
 					}
 					else
 					{
@@ -952,7 +951,7 @@ void Renderer::draw_air()
 			}
 			else if (displayMode & DISPLAY_AIRH)
 			{
-				c = RGB::Unpack(HeatToColour(hv[y][x]));
+				c = RGB::Unpack(HeatToColour(hv[y][x], stats.hdispLimitMin, stats.hdispLimitMax));
 				//c = RGB(clamp_flt(fabsf(vx[y][x]), 0.0f, 8.0f),//vx adds red
 				//	clamp_flt(hv[y][x], 0.0f, 1600.0f),//heat adds green
 				//	clamp_flt(fabsf(vy[y][x]), 0.0f, 8.0f)).Pack();//vy adds blue
@@ -1296,11 +1295,9 @@ void Renderer::render_fire()
 		}
 }
 
-int HeatToColour(float temp)
+int HeatToColour(float temp, float hdispLimitMin, float hdispLimitMax)
 {
-	constexpr float min_temp = MIN_TEMP;
-	constexpr float max_temp = MAX_TEMP;
-	RGB color = Renderer::heatTableAt(int((temp - min_temp) / (max_temp - min_temp) * 1024));
+	RGB color = Renderer::heatTableAt(int((temp - hdispLimitMin) / (hdispLimitMax - hdispLimitMin) * 1024));
 	color.Red   = uint8_t(color.Red   * 0.7f);
 	color.Green = uint8_t(color.Green * 0.7f);
 	color.Blue  = uint8_t(color.Blue  * 0.7f);
@@ -1376,6 +1373,62 @@ const std::vector<RenderPreset> Renderer::renderModePresets = {
 	},
 };
 
+void Renderer::AdjustHdispLimit()
+{
+	stats.hdispLimitValid = false;
+	float autoHdispLimitMin = MAX_TEMP;
+	float autoHdispLimitMax = MIN_TEMP;
+	auto visit = [this, &autoHdispLimitMin, &autoHdispLimitMax](Vec2<int> point, float value) {
+		if (autoHdispLimitArea.Contains(point))
+		{
+			autoHdispLimitMin = std::min(autoHdispLimitMin, value);
+			autoHdispLimitMax = std::max(autoHdispLimitMax, value);
+			stats.hdispLimitValid = true;
+		}
+	};
+	if (std::holds_alternative<HdispLimitAuto>(wantHdispLimitMin) ||
+	    std::holds_alternative<HdispLimitAuto>(wantHdispLimitMax))
+	{
+		auto &sd = SimulationData::CRef();
+		for (int i = 0; i <= sim->parts.lastActiveIndex; ++i)
+		{
+			auto t = sim->parts[i].type;
+			if (t > 0 && t < PT_NUM)
+			{
+				if (!sd.elements[t].HeatConduct)
+				{
+					continue;
+				}
+				auto nx = int(sim->parts[i].x + 0.5f);
+				auto ny = int(sim->parts[i].y + 0.5f);
+				visit({ nx, ny }, sim->parts[i].temp);
+			}
+		}
+		if (sim->aheat_enable && (displayMode & DISPLAY_AIR) && (displayMode & DISPLAY_AIRH))
+		{
+			auto *hv = sim->hv;
+			for (auto p : CELLS.OriginRect())
+			{
+				visit(p * CELL, hv[p.Y][p.X]);
+			}
+		}
+	}
+	stats.hdispLimitMin = autoHdispLimitMin;
+	stats.hdispLimitMax = autoHdispLimitMax;
+	if (auto *hdispLimitExplicit = std::get_if<HdispLimitExplicit>(&wantHdispLimitMin))
+	{
+		stats.hdispLimitMin = hdispLimitExplicit->value;
+	}
+	if (auto *hdispLimitExplicit = std::get_if<HdispLimitExplicit>(&wantHdispLimitMax))
+	{
+		stats.hdispLimitMax = hdispLimitExplicit->value;
+	}
+	if (std::isnan(stats.hdispLimitMin)) stats.hdispLimitMin = MIN_TEMP;
+	if (std::isnan(stats.hdispLimitMax)) stats.hdispLimitMax = MAX_TEMP;
+	stats.hdispLimitMax = std::clamp(stats.hdispLimitMax, MIN_TEMP, MAX_TEMP);
+	stats.hdispLimitMin = std::clamp(stats.hdispLimitMin, MIN_TEMP, stats.hdispLimitMax);
+}
+
 void Renderer::Clear()
 {
 	if(displayMode & DISPLAY_PERS)
@@ -1386,6 +1439,7 @@ void Renderer::Clear()
 	{
 		std::fill_n(video.data(), WINDOWW * YRES, 0);
 	}
+	AdjustHdispLimit();
 }
 
 void Renderer::DrawBlob(Vec2<int> pos, RGB colour)
diff --git a/src/graphics/Renderer.h b/src/graphics/Renderer.h
index e554de3c4..7a414db08 100644
--- a/src/graphics/Renderer.h
+++ b/src/graphics/Renderer.h
@@ -25,14 +25,14 @@ struct GraphicsFuncContext
 	Particle *pipeSubcallTpart;
 };
 
-int HeatToColour(float temp);
+int HeatToColour(float temp, float hdispLimitMin, float hdispLimitMax);
 
 class Renderer : private RendererSettings, public RasterDrawMethods<Renderer>
 {
 	RendererFrame video;
 	std::array<pixel, WINDOW.X * RES.Y> persistentVideo;
 	RendererFrame warpVideo;
-	int foundParticles = 0;
+	RendererStats stats;
 
 	Rect<int> GetClipRect() const
 	{
@@ -59,6 +59,8 @@ class Renderer : private RendererSettings, public RasterDrawMethods<Renderer>
 	void draw_grav();
 	void draw_other();
 
+	void AdjustHdispLimit();
+
 public:
 	Renderer();
 	void ApplySettings(const RendererSettings &newSettings);
@@ -73,9 +75,9 @@ public:
 		return video;
 	}
 
-	int GetFoundParticles() const
+	RendererStats GetStats() const
 	{
-		return foundParticles;
+		return stats;
 	}
 
 	const RenderableSimulation *sim = nullptr;
diff --git a/src/graphics/RendererFrame.h b/src/graphics/RendererFrame.h
index 4a02d4ac0..a546ffeaf 100644
--- a/src/graphics/RendererFrame.h
+++ b/src/graphics/RendererFrame.h
@@ -6,3 +6,11 @@
 
 constexpr auto RendererFrameSize = Vec2<int>{ WINDOW.X, RES.Y };
 using RendererFrame = PlaneAdapter<std::array<pixel, WINDOW.X * RES.Y>, RendererFrameSize.X, RendererFrameSize.Y>;
+
+struct RendererStats
+{
+	int foundParticles = 0;
+	float hdispLimitMin = 0;
+	float hdispLimitMax = 0;
+	bool hdispLimitValid = false;
+};
diff --git a/src/graphics/RendererSettings.h b/src/graphics/RendererSettings.h
index 36c5de0a5..12313224d 100644
--- a/src/graphics/RendererSettings.h
+++ b/src/graphics/RendererSettings.h
@@ -1,9 +1,23 @@
 #pragma once
 #include "gui/interface/Point.h"
 #include "simulation/ElementGraphics.h"
+#include "simulation/ElementDefs.h"
 #include "FindingElement.h"
 #include <cstdint>
 #include <optional>
+#include <variant>
+
+struct HdispLimitExplicit
+{
+	float value;
+};
+struct HdispLimitAuto
+{
+};
+using HdispLimit = std::variant<
+	HdispLimitExplicit,
+	HdispLimitAuto
+>;
 
 struct RendererSettings
 {
@@ -24,4 +38,7 @@ struct RendererSettings
 	ui::Point mousePos = { 0, 0 };
 	int gridSize = 0;
 	float fireIntensity = 1;
+	HdispLimit wantHdispLimitMin = HdispLimitExplicit{ MIN_TEMP };
+	HdispLimit wantHdispLimitMax = HdispLimitExplicit{ MAX_TEMP };
+	Rect<int> autoHdispLimitArea = RES.OriginRect();
 };
diff --git a/src/gui/game/GameView.cpp b/src/gui/game/GameView.cpp
index ce72a57e6..738a66e59 100644
--- a/src/gui/game/GameView.cpp
+++ b/src/gui/game/GameView.cpp
@@ -2166,7 +2166,7 @@ void GameView::OnDraw()
 			StartRendererThread();
 			WaitForRendererThread();
 			AfterSimDraw(*sim);
-			foundParticles = ren->GetFoundParticles();
+			rendererStats = ren->GetStats();
 			*rendererThreadResult = ren->GetVideo();
 			rendererFrame = rendererThreadResult.get();
 			DispatchRendererThread();
@@ -2177,7 +2177,7 @@ void GameView::OnDraw()
 			ren->ApplySettings(*rendererSettings);
 			RenderSimulation(*sim, true);
 			AfterSimDraw(*sim);
-			foundParticles = ren->GetFoundParticles();
+			rendererStats = ren->GetStats();
 			rendererFrame = &ren->GetVideo();
 		}
 	}
@@ -2525,10 +2525,19 @@ void GameView::OnDraw()
 		if (showDebug)
 		{
 			if (rendererSettings->findingElement)
-				fpsInfo << " Parts: " << foundParticles << "/" << sample.NumParts;
+				fpsInfo << " Parts: " << rendererStats.foundParticles << "/" << sample.NumParts;
 			else
 				fpsInfo << " Parts: " << sample.NumParts;
 		}
+		if ((std::holds_alternative<HdispLimitAuto>(rendererSettings->wantHdispLimitMin) ||
+		     std::holds_alternative<HdispLimitAuto>(rendererSettings->wantHdispLimitMax)) && rendererStats.hdispLimitValid)
+		{
+			fpsInfo << " [TEMP L:";
+			format::RenderTemperature(fpsInfo, rendererStats.hdispLimitMin, c->GetTemperatureScale());
+			fpsInfo << " H:";
+			format::RenderTemperature(fpsInfo, rendererStats.hdispLimitMax, c->GetTemperatureScale());
+			fpsInfo << "]";
+		}
 		if (c->GetReplaceModeFlags()&REPLACE_MODE)
 			fpsInfo << " [REPLACE MODE]";
 		if (c->GetReplaceModeFlags()&SPECIFIC_DELETE)
diff --git a/src/gui/game/GameView.h b/src/gui/game/GameView.h
index 11c114896..897c57570 100644
--- a/src/gui/game/GameView.h
+++ b/src/gui/game/GameView.h
@@ -174,7 +174,7 @@ private:
 	void DispatchRendererThread();
 	std::unique_ptr<RenderableSimulation> rendererThreadSim;
 	std::unique_ptr<RendererFrame> rendererThreadResult;
-	int foundParticles = 0;
+	RendererStats rendererStats;
 	const RendererFrame *rendererFrame = nullptr;
 
 	SimFpsLimit simFpsLimit = FpsLimitExplicit{ 60.f };
diff --git a/src/gui/options/OptionsView.cpp b/src/gui/options/OptionsView.cpp
index 20084d8b6..4e5bda5cd 100644
--- a/src/gui/options/OptionsView.cpp
+++ b/src/gui/options/OptionsView.cpp
@@ -411,7 +411,7 @@ void OptionsView::UpdateAmbientAirTempPreview(float airTemp, bool isValid)
 {
 	if (isValid)
 	{
-		ambientAirTempPreview->Appearance.BackgroundInactive = RGB::Unpack(HeatToColour(airTemp)).WithAlpha(0xFF);
+		ambientAirTempPreview->Appearance.BackgroundInactive = RGB::Unpack(HeatToColour(airTemp, MIN_TEMP, MAX_TEMP)).WithAlpha(0xFF);
 		ambientAirTempPreview->SetText("");
 	}
 	else
diff --git a/src/lua/LuaRenderer.cpp b/src/lua/LuaRenderer.cpp
index 470c02099..56c35d11d 100644
--- a/src/lua/LuaRenderer.cpp
+++ b/src/lua/LuaRenderer.cpp
@@ -243,6 +243,62 @@ static int separateThread(lua_State *L)
 	return 1;
 }
 
+static int heatDisplayLimits(lua_State *L)
+{
+	auto *lsi = GetLSI();
+	lsi->AssertInterfaceEvent();
+	auto &rendererSettings = lsi->gameModel->GetRendererSettings();
+	if (lua_gettop(L))
+	{
+		auto write = [L](auto &setting, int index) {
+			if (lua_isstring(L, index) && byteStringEqualsLiteral(tpt_lua_toByteString(L, index), "auto"))
+			{
+				setting = HdispLimitAuto{};
+			}
+			else
+			{
+				setting = HdispLimitExplicit{ float(luaL_checknumber(L, index)) };
+			}
+		};
+		write(rendererSettings.wantHdispLimitMin, 1);
+		write(rendererSettings.wantHdispLimitMax, 2);
+		return 0;
+	}
+	auto read = [L](auto &setting) {
+		if (auto *hdispLimitExplicit = std::get_if<HdispLimitExplicit>(&setting))
+		{
+			lua_pushnumber(L, hdispLimitExplicit->value);
+		}
+		else
+		{
+			lua_pushliteral(L, "auto");
+		}
+	};
+	read(rendererSettings.wantHdispLimitMin);
+	read(rendererSettings.wantHdispLimitMax);
+	return 2;
+}
+
+static int heatDisplayAutoArea(lua_State *L)
+{
+	auto *lsi = GetLSI();
+	lsi->AssertInterfaceEvent();
+	auto &rendererSettings = lsi->gameModel->GetRendererSettings();
+	if (lua_gettop(L))
+	{
+		rendererSettings.autoHdispLimitArea.pos .X = luaL_checkinteger(L, 1);
+		rendererSettings.autoHdispLimitArea.pos .Y = luaL_checkinteger(L, 2);
+		rendererSettings.autoHdispLimitArea.size.X = luaL_checkinteger(L, 3);
+		rendererSettings.autoHdispLimitArea.size.Y = luaL_checkinteger(L, 4);
+		return 0;
+	}
+	lua_pushinteger(L, rendererSettings.autoHdispLimitArea.pos .X);
+	lua_pushinteger(L, rendererSettings.autoHdispLimitArea.pos .Y);
+	lua_pushinteger(L, rendererSettings.autoHdispLimitArea.size.X);
+	lua_pushinteger(L, rendererSettings.autoHdispLimitArea.size.Y);
+	return 4;
+}
+
 void LuaRenderer::Open(lua_State *L)
 {
 	static const luaL_Reg reg[] = {
@@ -262,6 +318,8 @@ void LuaRenderer::Open(lua_State *L)
 		LFUNC(fireSize),
 		LFUNC(useDisplayPreset),
 		LFUNC(separateThread),
+		LFUNC(heatDisplayLimits),
+		LFUNC(heatDisplayAutoArea),
 #undef LFUNC
 		{ nullptr, nullptr }
 	};