Hi.
I have radiator termostat. I want to set up when window is oppened that hassio rember temperature and then when window is closed that this saved temperature is set back again?
Does any of you have same configuration done?
I would recommend to store your current temperature withn an input_number as soon as the window is openend and read it back into the thermostat if the window is closed again 
Depending on your thermostat device, you can link/bind a window opening sensor to the thermostate. Does work even without HA.
I tought of that but did not find any example how to store and read temperature
here is an example I just wrote (untested).
Please note that for this kind of automations (temporary storing ones) it is important to select “queued” mode as if not fast open/close actions might cause a “restore” faster than a “backup” action.
- id: window_climate_bath
alias: window_climate_bath
mode: queued
trigger:
- id: 'window_opened'
platform: state
entity_id: binary_sensor.strips_window_door_is_open
to: 'on'
- id: 'window_close'
platform: state
entity_id: binary_sensor.strips_window_door_is_open
to: 'off'
action:
- choose:
- conditions:
- condition: trigger
id: 'window_opened'
sequence:
- service: input_number.set_value
data_template:
value: "{{ state_attr('climate.hmip_bwth_bath','temperature') }}"
entity_id: input_number.hmip_bwth_bath_temp
- conditions:
- condition: trigger
id: 'window_close'
sequence:
- service: climate.set_temperature
data_template:
temperature: "{{ states('input_number.hmip_bwth_bath_temp') }}"
entity_id: climate.hmip_bwth_bath