home-assistant/automations/ac_precool_before_peak.yaml

# ac_precool_before_peak — pre-cool the house before the utility peak window
#
#   id / entity : ac_precool_before_peak  ->  automation.ac_pre_cool_before_peak
#   trigger     : 12:00 local (America/New_York)
#   purpose     : On work days, pre-cool before the 14:00-19:00 peak, harder when
#                 the forecast high is hotter (>=90 -> 68, >=85 -> 70, >=80 -> 71,
#                 below 80 -> no pre-cool).
#
# Graceful degradation (v2) — a broken dependency must NOT skip pre-cooling:
#   * workday sensor unavailable/unknown -> fall back to a plain Mon-Fri check.
#   * weather forecast fails or returns nothing -> assume a regular hot day
#     (high 88F -> 70F). weather.get_forecasts runs with continue_on_error so a
#     hard service error can't abort the run; the `fc is defined and is mapping`
#     guard catches the soft-failure (empty/None) case.
#
# NOTE: templates are kept on single lines on purpose — YAML folded scalars can
# inject stray whitespace/newlines into Jinja. Readability lives in this header.
#
# v2 (2026-07-09): added workday + weather fallbacks. See AUTOMATIONS.md.
id: ac_precool_before_peak
alias: AC - Pre-cool before peak
description: >-
  v2 (2026-07-09). Pre-cools before the 2-7pm peak on work days. Falls back to
  Mon-Fri if the workday sensor fails, and to a regular pre-cool (assume 88F high
  -> 70F) if the weather forecast fails. Managed in git; see AUTOMATIONS.md.
mode: single
triggers:
  - trigger: time
    at: "12:00:00"
conditions: []
actions:
  - action: weather.get_forecasts
    continue_on_error: true
    target:
      entity_id: weather.forecast_4315aspenhill
    data:
      type: daily
    response_variable: fc
  - variables:
      is_workday: "{% set wd = states('binary_sensor.workday_sensor') %}{% if wd in ['on','off'] %}{{ wd == 'on' }}{% else %}{{ now().weekday() < 5 }}{% endif %}"
      today_high: "{% if fc is defined and fc is mapping and 'weather.forecast_4315aspenhill' in fc and fc['weather.forecast_4315aspenhill'].forecast | default([]) | length > 0 %}{% set today = now().date() %}{% set entries = fc['weather.forecast_4315aspenhill'].forecast | selectattr('datetime') | list %}{% set match = entries | selectattr('datetime','search', today | string) | list %}{{ (match[0].temperature if match else entries[0].temperature) | float(88) }}{% else %}88{% endif %}"
      setpoint: "{% set h = today_high | float(88) %}{% if h >= 90 %}68{% elif h >= 85 %}70{% elif h >= 80 %}71{% else %}none{% endif %}"
  - if:
      - condition: template
        value_template: "{{ is_workday and setpoint != 'none' }}"
    then:
      - action: climate.set_hvac_mode
        target:
          entity_id: climate.t6_pro_z_wave_programmable_thermostat_with_smartstart
        data:
          hvac_mode: cool
      - action: climate.set_temperature
        target:
          entity_id: climate.t6_pro_z_wave_programmable_thermostat_with_smartstart
        data:
          temperature: "{{ setpoint | int }}"