This blueprint automates speed control of your fans in relation to your chosen temperature range.
It should work with any fans that use percentage step control and allows for fans where the integration shows maximum speed different to 100%.
The speed will be set when first turn the fan on, a customizable delay is used to avoid changing the fan too frequently. Subsequent speed changes are done in steps to allow for temporary manual speed override.
blueprint:
name: Auto fan speed
description: "Temperature based Auto fan control.\n\n
Fan Speed will be set when initially turned on by relating the ambient temperature
to an equivalant speed setting. \nA time delay is used to eliminate frequent speed changes.\n
As the temperature changes the fan speed will increase or decrease accordingly,
rather than being set. \nThis is to allow a manual change of starting speed.\n
At the minimum temperature setting the fan will be turned off."
domain: automation
input:
fan_switch:
name: Fan
description: The fan you wish to speed control.
selector:
entity:
domain: fan
min_fan_speed:
name: Minimum Fan Speed
description: Set the minimum speed at which your fan is still on. This is
also used to calculate percentage step of your fan.
default: 16
selector:
number:
min: 1.0
max: 100.0
mode: slider
step: 1.0
unit_of_measurement: "%"
max_fan_speed:
name: Maximum Fan Speed
description: Set the maximum percentage speed for your fan.
Just in case the fan integration has the maximum speed different to 100%.
default: 100
selector:
number:
min: 1.0
max: 100.0
mode: slider
step: 1.0
unit_of_measurement: "%"
high_temp_value:
name: What temperature would you like the fan to run at 100%
description: Set the high temperture sensor value.
default: 31
selector:
number:
min: 15
max: 40.0
step: 1.0
mode: slider
low_temp_value:
name: What temperature would you like the fan to run at minimum speed.
description: Set the low temperture sensor value.
default: 23
selector:
number:
min: 15
max: 40.0
step: 1.0
mode: slider
off_temp_value:
name: What temperature would you like the fan to turn off.
description: Set the fan OFF temperture sensor value.
default: 21.5
selector:
number:
min: 15
max: 40.0
step: 1.0
mode: slider
change_time:
name: Change frequency delay
description: How long to delay bewteen potential speed adjustments.
default: 30
selector:
number:
min: 1.0
max: 120.0
unit_of_measurement: minutes
step: 1
mode: slider
temp_sensor:
name: Temperature Sensor
description: Enter your temperature sensor.
default: []
selector:
entity:
domain: sensor
device_class: temperature
multiple: false
variables:
change_time: !input change_time
low_temp_value: !input low_temp_value
off_temp_value: !input off_temp_value
high_temp_value: !input high_temp_value
min_fan_speed: !input min_fan_speed
max_fan_speed: !input max_fan_speed
temp_sensor: !input temp_sensor
fan_switch: !input fan_switch
current_temp: "{{ states(temp_sensor) |float(0)}}"
fan_speed: "{{ state_attr(fan_switch,'percentage') |float(0)}}"
temp_range: "{{high_temp_value|float(0)-low_temp_value|float(0)}}"
fan_range: "{{max_fan_speed|float(0)-min_fan_speed|float(0)}}"
percent_per_degree: "{{fan_range|float(0)/temp_range|float(0)}}"
deg_above_min: "{{current_temp|float(0)-low_temp_value|float(0)}}"
set_fan_speed: "{{[[min_fan_speed|float(0) + (deg_above_min|float(0)*percent_per_degree|float(0)),min_fan_speed|float(0)]|max,max_fan_speed]|min |float(0)}}"
speed_diff: "{{(fan_speed - set_fan_speed)|abs}}"
speed_increase: "{{[(fan_speed + min_fan_speed),max_fan_speed]|min}}"
speed_decrease: "{{[(fan_speed - (min_fan_speed*1.2))|int,min_fan_speed]|max}}"
trigger:
- platform: state
entity_id:
- !input fan_switch
id: fanon
to: "on"
from: "off"
- platform: state
entity_id:
- !input temp_sensor
- platform: numeric_state
entity_id: !input temp_sensor
below: !input off_temp_value
condition:
- condition: template
value_template: "{{ states(fan_switch) == 'on' }}"
action:
- choose:
- conditions:
- condition: trigger
id: fanon
- condition: template
value_template: "{{ speed_diff|float(0) > min_fan_speed|float(0) }}"
sequence:
- service: homeassistant.turn_on
data:
percentage: "{{set_fan_speed}}"
target:
entity_id: "{{fan_switch}}"
- delay:
minutes: !input change_time
- conditions:
- condition: template
value_template: "{{ speed_diff|float(0) > min_fan_speed|float(0) }}"
- condition: template
value_template: "{{ fan_speed |float(0) < set_fan_speed|float(0) }}"
- condition: template
value_template: "{{ current_temp|float(0) > off_temp_value|float(0) }}"
- condition: template
value_template: "{{ states(fan_switch) == 'on' }}"
sequence:
- service: homeassistant.turn_on
target:
entity_id: "{{fan_switch}}"
data:
percentage: "{{speed_increase}}"
- delay:
minutes: !input change_time
- conditions:
- condition: template
value_template: "{{ speed_diff|float(0) > min_fan_speed|float(0) }}"
- condition: template
value_template: "{{ set_fan_speed|float(0) < fan_speed|float(0) }}"
- condition: template
value_template: "{{ current_temp|float(0) > off_temp_value|float(0) }}"
- condition: template
value_template: "{{ states(fan_switch) == 'on' }}"
sequence:
- service: homeassistant.turn_on
target:
entity_id: "{{fan_switch}}"
data:
percentage: "{{speed_decrease}}"
- delay:
minutes: !input change_time
- conditions:
- condition: not
conditions:
- condition: trigger
id: fanon
- condition: numeric_state
entity_id: !input temp_sensor
below: !input off_temp_value
sequence:
- service: homeassistant.turn_off
target:
entity_id: "{{fan_switch}}"
mode: single
Update:
Added an extra temp selection for minimum speed / turn off temp.
Added a condition to check fan is on to eliminate a log error.
