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hvac-failure-monitor.yaml
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165
hvac-failure-monitor.yaml
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blueprint:
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name: HVAC Failure Monitor
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description: >
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Detects HVAC underperformance and hard failure by monitoring temperature trends when heating or cooling is active.
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Uses differential between setpoint and outdoor temp to dynamically adjust expectations.
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domain: automation
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input:
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thermostat:
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name: Thermostat
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description: The climate entity to monitor (must support hvac_action and setpoint attributes).
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selector:
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entity:
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domain: climate
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heating_temp_sensors:
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name: Heating Temperature Sensors
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description: One or more temperature sensors to monitor during heating (e.g. upstairs).
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default: []
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selector:
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target:
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entity:
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domain: sensor
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device_class: temperature
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cooling_temp_sensors:
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name: Cooling Temperature Sensors
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description: One or more temperature sensors to monitor during cooling (e.g. downstairs).
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default: []
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selector:
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target:
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entity:
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domain: sensor
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device_class: temperature
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outdoor_sensor:
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name: Outdoor Temperature Source
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description: Outdoor temperature source (e.g. from a weather entity).
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selector:
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entity:
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domain: weather
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monitoring_interval:
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name: Monitoring Interval (minutes)
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description: How long after HVAC starts to evaluate temperature change.
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default: 20
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selector:
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number:
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min: 5
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max: 120
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unit_of_measurement: minutes
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mode: slider
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notify_target:
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name: Notification Target
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description: Who to notify on potential HVAC failure (e.g. mobile app).
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default: []
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selector:
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target:
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entity:
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domain: notify
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mode: single
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trigger:
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- platform: state
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entity_id: !input thermostat
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attribute: hvac_action
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to:
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- heating
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- cooling
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variables:
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thermostat: !input thermostat
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heating_temp_sensors: !input heating_temp_sensors
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cooling_temp_sensors: !input cooling_temp_sensors
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outdoor_sensor: !input outdoor_sensor
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interval: !input monitoring_interval
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hvac_action: "{{ state_attr(thermostat, 'hvac_action') }}"
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direction: >
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{{ 'rising' if hvac_action == 'heating' else 'falling' }}
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selected_sensors: >
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{{ heating_temp_sensors if hvac_action == 'heating' else cooling_temp_sensors }}
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condition: []
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action:
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- variables:
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indoor_start: >
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{{ expand(selected_sensors) | map(attribute='state') | map('float') | select('defined') | list | average }}
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- delay:
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minutes: "{{ interval }}"
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- variables:
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indoor_now: >
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{{ expand(selected_sensors) | map(attribute='state') | map('float') | select('defined') | list | average }}
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outdoor_now: >
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{{ state_attr(outdoor_sensor, 'temperature') | float }}
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setpoint: >
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{{ state_attr(thermostat, 'temperature') | float }}
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delta: >
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{{ abs(setpoint - outdoor_now) }}
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required_rate: >
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{% set d = delta %}
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{{ [0.01, [0.10, 0.10 - (d * 0.004)] | min] | max }}
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observed_rate: >
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{{ ((indoor_now - indoor_start) / interval) | round(3) }}
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trend_ok: >
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{% if direction == 'rising' %}
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{{ observed_rate >= required_rate }}
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{% else %}
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{{ observed_rate <= -required_rate }}
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{% endif %}
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hard_failure: >
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{% if direction == 'rising' %}
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{{ observed_rate < 0 }}
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{% else %}
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{{ observed_rate > 0 }}
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{% endif %}
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hvac_state_icon: >
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{% if hard_failure %}
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mdi:close-circle-outline
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{% elif not trend_ok %}
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mdi:alert-circle-outline
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{% else %}
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mdi:check-circle-outline
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{% endif %}
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hvac_state_text: >
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{% if hard_failure %}
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HVAC Failure
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{% elif not trend_ok %}
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Possible HVAC underperformance
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{% else %}
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Normal operation
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{% endif %}
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- choose:
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- conditions: "{{ not trend_ok }}"
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sequence:
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- choose:
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- conditions: "{{ notify_target | length > 0 }}"
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sequence:
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- service: notify.{{ notify_target }}
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data:
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message: >
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HVAC '{{ hvac_action }}' action for {{ interval }} minutes showed ineffective operation.
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Indoor temp started at: {{ indoor_start }}°, now: {{ indoor_now }}°
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Outdoor temp: {{ outdoor_now }}°
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Setpoint: {{ setpoint }}°
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Required rate: {{ required_rate }}°/min
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Observed rate: {{ observed_rate }}°/min
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Status: {{ hvac_state_text }} {{ hvac_state_icon }}
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default:
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- service: persistent_notification.create
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data:
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title: HVAC Alert
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message: >
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HVAC '{{ hvac_action }}' action for {{ interval }} minutes showed ineffective operation.
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Indoor temp started at: {{ indoor_start }}°, now: {{ indoor_now }}°
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Outdoor temp: {{ outdoor_now }}°
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Setpoint: {{ setpoint }}°
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Required rate: {{ required_rate }}°/min
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Observed rate: {{ observed_rate }}°/min
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Status: {{ hvac_state_text }} {{ hvac_state_icon }}
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