Purpose of event:start

1

With the help of others, I created an automation to alert me when my freezer temp is high. Can someone help me understand the following statement in the automation:

  - platform: homeassistant
    event: start

Does this mean HA only checks for a high temp with HA starts, or does it mean to “also” check when HA starts?

2

That would depend on the rest of the automation, which you have not shared with us.

3 
alias: Notify Reef Tank Low Temp
trigger:
  - platform: numeric_state
    entity_id: sensor.reef_tank_temperature
    below: 75.5
  - platform: homeassistant
    event: start
condition:
  - condition: numeric_state
    entity_id: sensor.reef_tank_temperature
    below: 75.5
action:
  - service: notify.gmail
    data:
      message: Check the Reef Tank. Temperature is below 75.5.
      title: Reef Tank Temperature Low
  - service: notify.mobile_app_shn_cell
    data:
      message: Check the Reef Tank. Temperature is below 75.5.
      title: Reef Tank Temperature Low
4

In that case it also checks at restart, in case the temperature went below the other numeric trigger point while HA was offline.

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