So… the sticky post is a good read.
The problem is, you deleted the thing that wasn’t working, so we have nothing to work with.
automation:
- alias: Make it work dammit
trigger:
- platform: numeric_state
entity_id: sensor.temperature_thingy
above: 20
action:
- service: climate.set_hvac_mode
data:
entity_id: climate.cooling_thingy
hvac_mode: cool
Something like that, probably