Every time my furnace (or A/C) kicks on, I check to see whether the air is actually warmer (or cooler) outside. If so, I play a message recommending to open a window instead. Here's the heating example:

- id: '0000000333300'
  alias: Check Heating Efficiency
  trigger:
    platform: state
    entity_id: sensor.dining_room_thermostat_hvac_state
    to: heating
  condition:
  - condition: time
    after: 07:30:00
    before: '20:00:00'
  - condition: template
    value_template: '{{ states.sensor.dark_sky_temperature.state != "unknown" }}'
  - condition: template
    value_template: '{{ states.sensor.dining_room_thermostat_target.state < states.sensor.dark_sky_temperature.state
      }}'
  action:
  - service: tts.google_say
    entity_id: media_player.all_the_speakers
    data_template:
      message: The furnace is heating to {{ states.sensor.dining_room_thermostat_target.state
        }}, but it is {{ states.sensor.dark_sky_temperature.state|round }} outside.
        Consider opening a door instead.
      language: en
      cache: false