diff --git a/Ontology/Willow/Capability/Actuator/Binary Actuator/OnOff Actuator/Dehumidifier/DehumidifierOnActuator.json b/Ontology/Willow/Capability/Actuator/Binary Actuator/OnOff Actuator/Dehumidifier/DehumidifierOnActuator.json
new file mode 100644
index 00000000..b8ed00ee
--- /dev/null
+++ b/Ontology/Willow/Capability/Actuator/Binary Actuator/OnOff Actuator/Dehumidifier/DehumidifierOnActuator.json	
@@ -0,0 +1,16 @@
+{
+  "@id": "dtmi:com:willowinc:DehumidifierOnActuator;1",
+  "@type": "Interface",
+  "displayName": {
+    "en": "Dehumidifier On Actuator"
+  },
+  "description": {"en": "The Boolean command which turns on an equipment's dehumidifier function when 'true'"},
+  "extends" : [
+    "dtmi:com:willowinc:OnActuator;1"
+  ],
+  "contents": [
+  ],
+  "@context": [
+    "dtmi:dtdl:context;3"
+  ]
+}
diff --git a/Ontology/Willow/Capability/Actuator/Percent Actuator/Level Actuator/On Level Actuator/Dehumidifier Level Actuator/DehumidifierLevelActuator.json b/Ontology/Willow/Capability/Actuator/Percent Actuator/Level Actuator/On Level Actuator/Dehumidifier Level Actuator/DehumidifierLevelActuator.json
new file mode 100644
index 00000000..2e7783bc
--- /dev/null
+++ b/Ontology/Willow/Capability/Actuator/Percent Actuator/Level Actuator/On Level Actuator/Dehumidifier Level Actuator/DehumidifierLevelActuator.json	
@@ -0,0 +1,17 @@
+{
+  "@id": "dtmi:com:willowinc:DehumidifierLevelActuator;1",
+  "@type": "Interface",
+  "displayName": {
+    "en": "Dehumidifier Level Actuator"
+  },
+  "description": {"en": "The percent command which sets the dehumidifier level of the equipment"},
+  "extends" : [
+    "dtmi:com:willowinc:OnLevelActuator;1"
+  ],
+  "contents": [
+
+  ],
+  "@context": [
+    "dtmi:dtdl:context;3"
+  ]
+}
diff --git a/Ontology/Willow/Capability/Performance Indicator/Percent/FanEfficiency.json b/Ontology/Willow/Capability/Performance Indicator/Percent/FanEfficiency.json
new file mode 100644
index 00000000..1a588cc9
--- /dev/null
+++ b/Ontology/Willow/Capability/Performance Indicator/Percent/FanEfficiency.json	
@@ -0,0 +1,19 @@
+{
+  "@id": "dtmi:com:willowinc:FanEfficiency;1",
+  "@type": "Interface",
+  "displayName": {
+    "en": "Fan Efficiency Ratio"
+  },
+  "description": {
+    "en": "A percent performance indicator for a fan which is the ratio of the power imparted to the airstream (airflow x total pressure) to its electrical power input."
+  },
+  "extends" : [
+    "dtmi:com:willowinc:PercentPerformanceIndicator;1"
+  ],
+  "contents": [
+
+  ],
+  "@context": [
+    "dtmi:dtdl:context;3"
+  ]
+}
diff --git a/Ontology/Willow/Capability/Performance Indicator/Percent/FanLoadLevel.json b/Ontology/Willow/Capability/Performance Indicator/Percent/FanLoadLevel.json
new file mode 100644
index 00000000..15c3508f
--- /dev/null
+++ b/Ontology/Willow/Capability/Performance Indicator/Percent/FanLoadLevel.json	
@@ -0,0 +1,19 @@
+{
+  "@id": "dtmi:com:willowinc:FanLoadLevel;1",
+  "@type": "Interface",
+  "displayName": {
+    "en": "Fan Load Level"
+  },
+  "description": {
+    "en": "A performance indicator for a fan which is the ratio of its electrical power input (kW) to its nameplate motor power rating (HP) converted to a percent."
+  },
+  "extends" : [
+    "dtmi:com:willowinc:PercentPerformanceIndicator;1"
+  ],
+  "contents": [
+
+  ],
+  "@context": [
+    "dtmi:dtdl:context;3"
+  ]
+}
diff --git a/Ontology/Willow/Capability/Performance Indicator/Quantity/Specific Fan Power/SpecificFanPower.json b/Ontology/Willow/Capability/Performance Indicator/Quantity/Specific Fan Power/SpecificFanPower.json
new file mode 100644
index 00000000..4e4cd733
--- /dev/null
+++ b/Ontology/Willow/Capability/Performance Indicator/Quantity/Specific Fan Power/SpecificFanPower.json	
@@ -0,0 +1,19 @@
+{
+  "@id": "dtmi:com:willowinc:SpecificFanPower;1",
+  "@type": "Interface",
+  "displayName": {
+    "en": "Specific Fan Power"
+  },
+  "description": {
+    "en": "A performance indicator for a fan which is the ratio of its electrical power input (kW) to the amount of air it moves (CFM), a.k.a. SFP."
+  },
+  "extends" : [
+    "dtmi:com:willowinc:RatioPerformanceIndicator;1"
+  ],
+  "contents": [
+
+  ],
+  "@context": [
+    "dtmi:dtdl:context;3"
+  ]
+}
diff --git a/Ontology/Willow/Capability/State/Binary State/OnOff State/Dehumidifier/DehumidifierOnState.json b/Ontology/Willow/Capability/State/Binary State/OnOff State/Dehumidifier/DehumidifierOnState.json
new file mode 100644
index 00000000..d7043d99
--- /dev/null
+++ b/Ontology/Willow/Capability/State/Binary State/OnOff State/Dehumidifier/DehumidifierOnState.json	
@@ -0,0 +1,16 @@
+{
+  "@id": "dtmi:com:willowinc:DehumidifierOnState;1",
+  "@type": "Interface",
+  "displayName": {
+    "en": "Dehumidifier On State"
+  },
+  "description": {"en": "The Boolean state of an equipment's dehumidifier function which is 'on' when 'true'"},
+  "extends" : [
+    "dtmi:com:willowinc:OnState;1"
+  ],
+  "contents": [
+  ],
+  "@context": [
+    "dtmi:dtdl:context;3"
+  ]
+}