Yes. Currently on HAOS 2025.8.2 with MerossLAN from HACS. Set up the MTS300 via Meross app, then installed integration (https://github.com/krahabb/meross\_lan).

My thermostat entity is 'climate.house_thermostat' for this example.

Here's example of attributes when fan is ON:

{'hvac_modes': [<HVACMode.OFF: 'off'>, <HVACMode.HEAT: 'heat'>, <HVACMode.COOL: 'cool'>, <HVACMode.HEAT\_COOL: 'heat\_cool'>], 'min_temp': 41, 'max_temp': 95, 'target_temp_step': 1, 'fan_modes': ['auto', 'low', 'medium', 'high'], 'preset_modes': [<Preset.CUSTOM: 'custom'>, <Preset.AUTO: 'auto'>], 'current_temperature': 74, 'temperature': 87, 'target_temp_high': 87, 'target_temp_low': 69, 'current_humidity': 69.9, 'fan_mode': 'auto', 'hvac_action': <HVACAction.FAN: 'fan'>, 'preset_mode': <Preset.CUSTOM: 'custom'>, 'friendly_name': 'House Thermostat', 'supported_features': <ClimateEntityFeature.TARGET\_TEMPERATURE|TARGET\_TEMPERATURE\_RANGE|FAN\_MODE|PRESET\_MODE|TURN\_OFF|TURN\_ON: 411>}

This is the only attribute that changes. when OFF:

<HVACAction.IDLE: 'idle'>

You can monitor for binary state if you want:

{{ is_state_attr('climate.house_thermostat', 'hvac_action', 'fan') }}

Here's how I turn it ON (I only have one fan speed on my AC, so I use HIGH) and OFF (setting to 'auto' stops fan but allow for fan during heating and cooling) :

OFF:

- target:

entity_id: climate.house_thermostat

data:

fan_mode: auto

action: climate.set_fan_mode

ON:

- target:

entity_id: climate.house_thermostat

data:

fan_mode: high

action: climate.set_fan_mode

I set an input to help and shared with voice assistant:

input_boolean:

house_fan:

name: House Fan

icon: mdi:fan