diff --git a/homeassistant/components/climacell/const.py b/homeassistant/components/climacell/const.py
index 7f93b9a6507..f5d2ac02696 100644
--- a/homeassistant/components/climacell/const.py
+++ b/homeassistant/components/climacell/const.py
@@ -35,6 +35,8 @@ from homeassistant.const import (
     CONF_UNIT_OF_MEASUREMENT,
     CONF_UNIT_SYSTEM_IMPERIAL,
     CONF_UNIT_SYSTEM_METRIC,
+    DEVICE_CLASS_CO,
+    DEVICE_CLASS_PRESSURE,
     DEVICE_CLASS_TEMPERATURE,
     IRRADIATION_BTUS_PER_HOUR_SQUARE_FOOT,
     IRRADIATION_WATTS_PER_SQUARE_METER,
@@ -185,6 +187,7 @@ CC_SENSOR_TYPES = [
             val, PRESSURE_INHG, PRESSURE_HPA
         ),
         ATTR_IS_METRIC_CHECK: True,
+        ATTR_DEVICE_CLASS: DEVICE_CLASS_PRESSURE,
     },
     {
         ATTR_FIELD: CC_ATTR_SOLAR_GHI,
@@ -265,6 +268,7 @@ CC_SENSOR_TYPES = [
         ATTR_FIELD: CC_ATTR_CARBON_MONOXIDE,
         ATTR_NAME: "Carbon Monoxide",
         CONF_UNIT_OF_MEASUREMENT: CONCENTRATION_PARTS_PER_BILLION,
+        ATTR_DEVICE_CLASS: DEVICE_CLASS_CO,
     },
     {
         ATTR_FIELD: CC_ATTR_SULFUR_DIOXIDE,
@@ -404,6 +408,7 @@ CC_V3_SENSOR_TYPES = [
         ATTR_FIELD: CC_V3_ATTR_CARBON_MONOXIDE,
         ATTR_NAME: "Carbon Monoxide",
         CONF_UNIT_OF_MEASUREMENT: CONCENTRATION_PARTS_PER_MILLION,
+        ATTR_DEVICE_CLASS: DEVICE_CLASS_CO,
     },
     {
         ATTR_FIELD: CC_V3_ATTR_SULFUR_DIOXIDE,