Okay so here's what I've got so far :

diff --git a/libdyson/libdyson/__init__.py b/libdyson-new/__init__.py
index 7b05791..ae8fb07 100644
--- a/libdyson/libdyson/__init__.py
+++ b/libdyson-new/__init__.py
@@ -15,6 +15,7 @@ from .const import (
     DEVICE_TYPE_PURE_HOT_COOL_LINK,
     DEVICE_TYPE_PURE_HUMIDIFY_COOL,
     DEVICE_TYPE_PURIFIER_HUMIDIFY_COOL_FORMALDEHYDE,
+    DEVICE_TYPE_PURE_HOT_COOL_FORMALDEHYDE,
 )
 from .const import CleaningMode  # noqa: F401
 from .const import CleaningType  # noqa: F401
@@ -32,7 +33,7 @@ from .dyson_device import DysonDevice
 from .dyson_pure_cool import DysonPureCool
 from .dyson_pure_cool import DysonPureCoolFormaldehyde
 from .dyson_pure_cool_link import DysonPureCoolLink
-from .dyson_pure_hot_cool import DysonPureHotCool
+from .dyson_pure_hot_cool import DysonPureHotCool, DysonPureHotCoolFormaldehyde
 from .dyson_pure_hot_cool_link import DysonPureHotCoolLink
 from .dyson_pure_humidify_cool import DysonPureHumidifyCool, DysonPurifierHumidifyCoolFormaldehyde
 from .utils import get_mqtt_info_from_wifi_info  # noqa: F401
@@ -58,6 +59,8 @@ def get_device(serial: str, credential: str, device_type: str) -> Optional[Dyson
         return DysonPureCoolFormaldehyde(serial, credential, device_type)
     if device_type == DEVICE_TYPE_PURE_HOT_COOL_LINK:
         return DysonPureHotCoolLink(serial, credential, device_type)
+    if device_type == DEVICE_TYPE_PURE_HOT_COOL_FORMALDEHYDE:
+        return DysonPureHotCoolFormaldehyde(serial, credential, device_type)
     if device_type in [
         DEVICE_TYPE_PURE_HOT_COOL,
         DEVICE_TYPE_PURE_HOT_COOL_NEW,
diff --git a/libdyson/libdyson/const.py b/libdyson-new/const.py
index 254e1cb..d655aa0 100644
--- a/libdyson/libdyson/const.py
+++ b/libdyson-new/const.py
@@ -13,6 +13,7 @@ DEVICE_TYPE_PURIFIER_HUMIDIFY_COOL_FORMALDEHYDE = "358E"
 DEVICE_TYPE_PURE_HOT_COOL_LINK = "455"
 DEVICE_TYPE_PURE_HOT_COOL = "527"
 DEVICE_TYPE_PURE_HOT_COOL_NEW = "527E"
+DEVICE_TYPE_PURE_HOT_COOL_FORMALDEHYDE = "527K"

 DEVICE_TYPE_NAMES = {
     DEVICE_TYPE_360_EYE: "360 Eye robot vacuum",
@@ -27,6 +28,7 @@ DEVICE_TYPE_NAMES = {
     DEVICE_TYPE_PURE_HOT_COOL_LINK: "Pure Hot+Cool Link",
     DEVICE_TYPE_PURE_HUMIDIFY_COOL: "Pure Humidify+Cool",
     DEVICE_TYPE_PURIFIER_HUMIDIFY_COOL_FORMALDEHYDE: "Purifier Humidify+Cool Formaldehyde",
+    DEVICE_TYPE_PURE_HOT_COOL_FORMALDEHYDE: "Pure Hot+Cool Formaldehyde"
 }

 ENVIRONMENTAL_OFF = -1
diff --git a/libdyson/libdyson/dyson_pure_hot_cool.py b/libdyson-new/dyson_pure_hot_cool.py
index 3ceb789..561b383 100644
--- a/libdyson/libdyson/dyson_pure_hot_cool.py
+++ b/libdyson-new/dyson_pure_hot_cool.py
@@ -1,8 +1,17 @@
 """Dyson Pure Hot+Cool device."""

+from typing import Optional
+
 from .dyson_device import DysonHeatingDevice
 from .dyson_pure_cool import DysonPureCool

-
 class DysonPureHotCool(DysonPureCool, DysonHeatingDevice):
     """Dyson Pure Hot+Cool device."""
+
+class DysonPureHotCoolFormaldehyde(DysonPureHotCool):
+    """Dyson Pure Hot+Cool Formaldehyde device."""
+
+    @property
+    def formaldehyde(self) -> Optional[int]:
+        """Return formaldehyde reading."""
+        return self._get_environmental_field_value("hcho")

Instantiates and works fine, but the formaldehyde entity is still missing, not sure why.
I'll have another look later on, but hopefully this is about it and just need a small fix to get the sensor to register.

Uh oh!

Please add new model #31

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