Set Minimum Aircon Target Temp

I have a number of Samsung Windfree aircon units, which I can see in HA via the Smartthings integration.
My pesky family keeps setting very low (eg 22 degrees C) target temperatures (we do live in a hot climate), but I would like to try to set up an automation that would change the target temp back to what I consider reasonable (25 degrees) if they set “too low”.
Not trying to be mean, but our utility bills can be crazy, and I need to try to keep this a little in check. I would need this to repeat as necessary, as I am sure someone will keep trying to reduce the temp if the automation worked once !
Small problem - I have absolutely no idea how to go about this. Although I am about a year into my HA journey, many things do not come easy to me - I would say I am roughly 14.7% computer literate, and roughly 5.2% familiar with HA
Thank you in advance

You want to trigger on the temperature being set low; that’s a numeric state trigger. However the set temperature is an attribute, not the state of the climate entity so be aware of that and use the attribute option. You can check the trigger details here: https://www.home-assistant.io/docs/automation/trigger/#numeric-state-trigger

The action is to set the target temperature. Service options and examples can be seen in the documentation, e.g. for climate devices there is a set temperature service: https://www.home-assistant.io/integrations/climate/#service-climateset_temperature

I’ve also thrown in a small delay so the person adjusting the thermostat is less likely to notice it being chnaged back.

trigger:
  - platform: numeric_state
    entity_id: climate.your_climate_device_here
    attribute: temperature
    below: 25
action:
  - delay: 6 # seconds, so they don't notice it going back up. 
  - service: climate.set_temperature
    target:
      entity_id: climate.your_climate_device_here
    data:
      temperature: 25

Wonderful, thank you Tom. Works perfectly - but then of course you knew it would.
Not sure if you can do a follow up - looking to set a person to being away if either of their two phones are away - they sometimes take one and sometimes the other. I am pretty sure the default for this would be if either phone is home, then the person is considered home.

You could try an Old Style Group. With the all: option set to true.

Tom (or anyone else who can assist)
Sorry struggling with the code. I have the following in my config file now:

group:
  aldrian:
  name: "Aldrian"
  entities: 
    device_tracker: device_tracker.a_phone
    device_tracker: device_tracker.b_phone
  all: true 

However I get a “duplicate mapping” message (and did try indenting the all: true line to see if it helped, but the duplicate mapping reference appears to the second device tracker line
Can you sort me out please
Should I move this to a new topic ?

Try this:

group:
  aldrian:
  name: "Aldrian"
  entities: 
    - device_tracker: device_tracker.a_phone
    - device_tracker: device_tracker.b_phone
  all: true 

Wonderful thank you
Is that all that is required ?