diff --git a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.CVars.cs b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.CVars.cs
index bcd628a60d..7f82e6fb57 100644
--- a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.CVars.cs
+++ b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.CVars.cs
@@ -52,7 +52,7 @@ namespace Content.Server.Atmos.EntitySystems
             _cfg.OnValueChanged(CCVars.AtmosMaxProcessTime, value => AtmosMaxProcessTime = value, true);
             _cfg.OnValueChanged(CCVars.AtmosTickRate, value => AtmosTickRate = value, true);
             _cfg.OnValueChanged(CCVars.AtmosSpeedup, value => Speedup = value, true);
-            _cfg.OnValueChanged(CCVars.AtmosHeatScale, value => HeatScale = value, true);
+            _cfg.OnValueChanged(CCVars.AtmosHeatScale, value => { HeatScale = value; InitializeGases(); }, true);
             _cfg.OnValueChanged(CCVars.ExcitedGroups, value => ExcitedGroups = value, true);
             _cfg.OnValueChanged(CCVars.ExcitedGroupsSpaceIsAllConsuming, value => ExcitedGroupsSpaceIsAllConsuming = value, true);
         }
diff --git a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Gases.cs b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Gases.cs
index 41470c170c..6a63185811 100644
--- a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Gases.cs
+++ b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Gases.cs
@@ -35,7 +35,7 @@ namespace Content.Server.Atmos.EntitySystems
 
             for (var i = 0; i < GasPrototypes.Length; i++)
             {
-                _gasSpecificHeats[i] = GasPrototypes[i].SpecificHeat;
+                _gasSpecificHeats[i] = GasPrototypes[i].SpecificHeat / HeatScale;
                 GasReagents[i] = GasPrototypes[i].Reagent;
             }
         }
@@ -61,7 +61,7 @@ namespace Content.Server.Atmos.EntitySystems
             NumericsHelpers.Multiply(moles, GasSpecificHeats, tmp);
             // Adjust heat capacity by speedup, because this is primarily what
             // determines how quickly gases heat up/cool.
-            return MathF.Max(NumericsHelpers.HorizontalAdd(tmp), Atmospherics.MinimumHeatCapacity) / HeatScale;
+            return MathF.Max(NumericsHelpers.HorizontalAdd(tmp), Atmospherics.MinimumHeatCapacity);
         }
 
         /// <summary>
diff --git a/Content.Shared/CCVar/CCVars.cs b/Content.Shared/CCVar/CCVars.cs
index 087e7bb850..a8b2960728 100644
--- a/Content.Shared/CCVar/CCVars.cs
+++ b/Content.Shared/CCVar/CCVars.cs
@@ -1053,14 +1053,14 @@ namespace Content.Shared.CCVar
         ///     in-game.
         /// </summary>
         public static readonly CVarDef<float> AtmosSpeedup =
-            CVarDef.Create("atmos.speedup", 1f, CVar.SERVERONLY);
+            CVarDef.Create("atmos.speedup", 8f, CVar.SERVERONLY);
 
         /// <summary>
         ///     Like atmos.speedup, but only for gas and reaction heat values. 64x means
         ///     gases heat up and cool down 64x faster than real life.
         /// </summary>
         public static readonly CVarDef<float> AtmosHeatScale =
-            CVarDef.Create("atmos.heat_scale", 1f, CVar.SERVERONLY);
+            CVarDef.Create("atmos.heat_scale", 8f, CVar.SERVERONLY);
 
         /*
          * MIDI instruments