We have a Flexit balanced ventilation system.
Unfortunately it doesn’t have any smartness, so it stays on the same ventilation level if it’s hot or humid.
Fortunately it’s possible to control the system through relays and with the help of ESP (ESPHome) and Aqara Humidity sensors.
Since humidity is changing from day to day I have made an average humidity sensor for the whole house as a baseline to trigger changes in humidity in bathrooms.
ESP:
switch:
- platform: gpio
pin: 5
name: "S1 fan speed 1"
id: relay1
interlock: &interlock_group [relay1, relay2, relay3, relay4]
- platform: gpio
pin: 4
name: "S2 fan speed 2"
id: relay2
interlock: *interlock_group
- platform: gpio
pin: 0
name: "S3 fan speed 3"
id: relay3
interlock: *interlock_group
- platform: gpio
pin: 14
name: "S4 fan speed 4"
id: relay4
interlock: *interlock_group
- platform: gpio
pin: 12
name: "Cooling recovery"
id: relay5
- platform: gpio
pin: 13
name: "Relay 6"
id: relay6
Sensor:
# Humidity average house
- platform: template
sensors:
humidity_average_house:
friendly_name: 'Humidity average house'
value_template: "{{ ((state_attr('sensor.living_room1_humidity_air', 'value') + state_attr('sensor.living_room2_humidity_air', 'value') + state_attr('sensor.attic1_humidity_air', 'value') + state_attr('sensor.attic2_humidity_air', 'value') + state_attr('sensor.office_humidity_air', 'value')) /5) }}"
unit_of_measurement: "%"
Binary sensor:
- platform: template
sensors:
high_humidity_main_bathroom:
value_template: >-
{{ (states('sensor.humidity_average_house') | float *1.2) < (states('sensor.main_bathroom_temperature_sensor_humidity')) | float}}
- platform: template
sensors:
high_humidity_bathroom:
value_template: >-
{{ (states('sensor.humidity_average_house') | float *1.2) < (states('sensor.bathroom_temperature_sensor_humidity')) | float}}
Automation:
# Ventilation state
- alias: Ventilation state
id: ventilation_state
trigger:
- platform: homeassistant
event: start
- platform: time_pattern
minutes: "/5"
- platform: state
entity_id: binary_sensor.high_humidity_main_bathroom
to: 'on'
- platform: state
entity_id: binary_sensor.high_humidity_bathroom
to: 'on'
- platform: state
entity_id: binary_sensor.high_humidity_main_bathroom
to: 'off'
- platform: state
entity_id: binary_sensor.high_humidity_bathroom
to: 'off'
action:
- choose:
# Choice 0 - High temperature increase ventilation
- conditions:
- condition: and
conditions:
- condition: numeric_state
entity_id: sensor.garden_temperature
above: 5
- condition: numeric_state
entity_id: sensor.living_room_1_temperature_air
above: 24
- condition: numeric_state
entity_id: sensor.living_room_2_temperature_air
above: 25
- condition: numeric_state
entity_id: sensor.living_room_3_temperature_air
above: 25
- condition: state
entity_id: switch.s4_fan_speed_4
state: 'off'
- condition: state
entity_id: binary_sensor.high_humidity_main_bathroom
state: 'off'
- condition: state
entity_id: binary_sensor.high_humidity_bathroom
state: 'off'
sequence:
- service: switch.turn_on
data:
entity_id: switch.s4_fan_speed_4
- delay: '00:00:10'
- service: switch.turn_on
data:
entity_id: switch.cooling_recovery
# Choice 1 - Lower temperature decrease ventilation
- conditions:
- condition: and
conditions:
- condition: numeric_state
entity_id: sensor.living_room_1_temperature_air
below: 23.9
- condition: numeric_state
entity_id: sensor.living_room_2_temperature_air
below: 24.9
- condition: numeric_state
entity_id: sensor.living_room_3_temperature_air
below: 24.9
- condition: state
entity_id: switch.s2_fan_speed_2
state: 'off'
- condition: state
entity_id: binary_sensor.high_humidity_main_bathroom
state: 'off'
- condition: state
entity_id: binary_sensor.high_humidity_bathroom
state: 'off'
sequence:
- service: switch.turn_on
data:
entity_id: switch.s2_fan_speed_2
- delay: '00:00:10'
- service: switch.turn_off
data:
entity_id: switch.cooling_recovery
# Choice 2 - Low temperature turn off cooling
- conditions:
- condition: and
conditions:
- condition: numeric_state
entity_id: sensor.garden_temperature
below: 5
- condition: state
entity_id: binary_sensor.high_humidity_main_bathroom
state: 'off'
- condition: state
entity_id: binary_sensor.high_humidity_bathroom
state: 'off'
sequence:
- service: switch.turn_off
data:
entity_id: switch.cooling_recovery
# Choice 3 - High humidity increase ventilation
- conditions:
- condition: and
conditions:
- condition: state
entity_id: binary_sensor.high_humidity_main_bathroom
state: 'on'
- condition: state
entity_id: switch.s4_fan_speed_4
state: 'off'
sequence:
- service: switch.turn_on
data:
entity_id: switch.s4_fan_speed_4
# Choice 4 - High humidity increase ventilation
- conditions:
- condition: and
conditions:
- condition: state
entity_id: binary_sensor.high_humidity_bathroom
state: 'on'
- condition: state
entity_id: switch.s4_fan_speed_4
state: 'off'
sequence:
- service: switch.turn_on
data:
entity_id: switch.s4_fan_speed_4
# Choice 5 - Low humidity decrease ventilation
- conditions:
- condition: and
conditions:
- condition: state
entity_id: binary_sensor.high_humidity_main_bathroom
state: 'off'
- condition: state
entity_id: binary_sensor.high_humidity_bathroom
state: 'off'
- condition: state
entity_id: switch.s2_fan_speed_2
state: 'off'
sequence:
- service: switch.turn_on
data:
entity_id: switch.s2_fan_speed_2
