Home-AssistantConfig/config/packages/climate.yaml

input_datetime:
  downstairs_last_filter_change:
    name: Downstairs Last Filter Change
    has_date: true
    has_time: true

  upstairs_last_filter_change:
    name: Upstairs Last Filter Change
    has_date: true
    has_time: true

binary_sensor:
  - platform: template
    sensors:
      downstairs_ac_cooling:
        friendly_name: "Downstairs AC is Cooling"
        value_template: >
          {{ state_attr('climate.downstairs', 'hvac_action') == 'cooling' }}

      upstairs_ac_cooling:
        friendly_name: "Upstairs AC is Cooling"
        value_template: >
          {{ state_attr('climate.upstairs', 'hvac_action') == 'cooling' }}

sensor:
  - platform: history_stats
    name: Downstairs AC Runtime Since Last Filter Change
    entity_id: binary_sensor.downstairs_ac_cooling
    state: 'on'
    type: time
    start: "{{ states('input_datetime.downstairs_last_filter_change') }}"
    end: "{{ now() }}"

  - platform: history_stats
    name: Upstairs AC Runtime Since Last Filter Change
    entity_id: binary_sensor.upstairs_ac_cooling
    state: 'on'
    type: time
    start: "{{ states('input_datetime.upstairs_last_filter_change') }}"
    end: "{{ now() }}"

script:
  reset_filter_change_date:
    alias: Reset Downstairs Filter Change Date
    sequence:
      - service: input_datetime.set_datetime
        data:
          entity_id: input_datetime.downstairs_last_filter_change
          datetime: "{{ now().strftime('%Y-%m-%d %H:%M:%S') }}"

automation:
  - alias: Notify Downstairs Filter Change Due
    description: "Notify when AC runtime exceeds threshold since last filter change"
    trigger:
      - platform: numeric_state
        entity_id: sensor.downstairs_ac_runtime_since_last_filter_change
        above: 800 
    action:
      - service: script.notify_engine
        data:
          title: "Home Maintenance Reminder"
          value1: "It's time to change your Downstairs AC filter."
          value2: "Runtime has exceeded 800 hours. Last changed {{ ((now() - states.input_datetime.downstairs_last_filter_change.last_changed).total_seconds() / 86400) | round(0) }} days ago."
          who: "Carlo"
          group: "maintenance"
          level: "active"

  - alias: Notify Upstairs Filter Change Due
    description: "Notify when AC runtime exceeds threshold since last filter change"
    trigger:
      - platform: numeric_state
        entity_id: sensor.upstairs_ac_runtime_since_last_filter_change
        above: 450
    action:
      - service: script.notify_engine
        data:
          title: "Home Maintenance Reminder"
          value1: "It's time to change your Upstairs AC filter."
          value2: "Runtime has exceeded 450 hours. Last changed {{ ((now() - states.input_datetime.upstairs_last_filter_change.last_changed).total_seconds() / 86400) | round(0) }} days ago."
          who: "Carlo"
          group: "maintenance"