diff --git a/api/profile.php b/api/profile.php
index 33b31f5..1d62478 100644
--- a/api/profile.php
+++ b/api/profile.php
@@ -936,7 +936,9 @@ class profile extends cora\crud {
         'heat_1' => null,
         'heat_2' => null,
         'cool_1' => null,
-        'cool_2' => null
+        'cool_2' => null,
+        'auxiliary_heat_1' => null,
+        'auxiliary_heat_2' => null
       ],
       'balance_point' => [
         'heat_1' => null,
@@ -1043,6 +1045,12 @@ class profile extends cora\crud {
         if($profile['runtime']['heat_2'] > 0) {
           $profile['runtime_per_degree_day']['heat_2'] = round($profile['runtime']['heat_2'] / $profile['degree_days']['heat'], 2);
         }
+        if($profile['runtime']['auxiliary_heat_1'] > 0) {
+          $profile['runtime_per_degree_day']['auxiliary_heat_1'] = round($profile['runtime']['auxiliary_heat_1'] / $profile['degree_days']['heat'], 2);
+        }
+        if($profile['runtime']['auxiliary_heat_2'] > 0) {
+          $profile['runtime_per_degree_day']['auxiliary_heat_2'] = round($profile['runtime']['auxiliary_heat_2'] / $profile['degree_days']['heat'], 2);
+        }
       }
     }
 
diff --git a/api/thermostat.php b/api/thermostat.php
index da716a9..88d31c7 100644
--- a/api/thermostat.php
+++ b/api/thermostat.php
@@ -418,6 +418,8 @@ class thermostat extends cora\crud {
       'runtime_per_degree_day' => [
         'heat_1',
         'heat_2',
+        'auxiliary_heat_1',
+        'auxiliary_heat_2',
         'cool_1',
         'cool_2'
       ],
@@ -447,6 +449,8 @@ class thermostat extends cora\crud {
     $intervals['runtime_per_degree_day'] = [
       'heat_1' => 1,
       'heat_2' => 1,
+      'auxiliary_heat_1' => 1,
+      'auxiliary_heat_2' => 1,
       'cool_1' => 1,
       'cool_2' => 1
     ];
diff --git a/js/component/metric/runtime_per_degree_day/auxiliary_heat_1.js b/js/component/metric/runtime_per_degree_day/auxiliary_heat_1.js
new file mode 100644
index 0000000..8e67b29
--- /dev/null
+++ b/js/component/metric/runtime_per_degree_day/auxiliary_heat_1.js
@@ -0,0 +1,22 @@
+/**
+ * Runtime / HDD for Auxiliary Heat Stage 1
+ *
+ * @param {number} thermostat_id The thermostat ID.
+ */
+beestat.component.metric.runtime_per_degree_day.auxiliary_heat_1 = function(thermostat_id) {
+  this.thermostat_id_ = thermostat_id;
+
+  beestat.component.metric.runtime_per_degree_day.apply(this, arguments);
+};
+beestat.extend(beestat.component.metric.runtime_per_degree_day.auxiliary_heat_1, beestat.component.metric.runtime_per_degree_day);
+
+beestat.component.metric.runtime_per_degree_day.auxiliary_heat_1.prototype.child_metric_name_ = 'auxiliary_heat_1';
+
+/**
+ * Get the icon of this metric.
+ *
+ * @return {string} The icon of this metric.
+ */
+beestat.component.metric.runtime_per_degree_day.auxiliary_heat_1.prototype.get_icon_ = function() {
+  return 'fire';
+};
diff --git a/js/component/metric/runtime_per_degree_day/auxiliary_heat_2.js b/js/component/metric/runtime_per_degree_day/auxiliary_heat_2.js
new file mode 100644
index 0000000..79510c8
--- /dev/null
+++ b/js/component/metric/runtime_per_degree_day/auxiliary_heat_2.js
@@ -0,0 +1,22 @@
+/**
+ * Runtime / HDD for Auxiliary Heat Stage 2
+ *
+ * @param {number} thermostat_id The thermostat ID.
+ */
+beestat.component.metric.runtime_per_degree_day.auxiliary_heat_2 = function(thermostat_id) {
+  this.thermostat_id_ = thermostat_id;
+
+  beestat.component.metric.runtime_per_degree_day.apply(this, arguments);
+};
+beestat.extend(beestat.component.metric.runtime_per_degree_day.auxiliary_heat_2, beestat.component.metric.runtime_per_degree_day);
+
+beestat.component.metric.runtime_per_degree_day.auxiliary_heat_2.prototype.child_metric_name_ = 'auxiliary_heat_2';
+
+/**
+ * Get the icon of this metric.
+ *
+ * @return {string} The icon of this metric.
+ */
+beestat.component.metric.runtime_per_degree_day.auxiliary_heat_2.prototype.get_icon_ = function() {
+  return 'fire';
+};