This automation blueprint links a thermostat (any “climate” device) to the day/night cycle. You set a temperature for sunrise/sunset and one each for the middle of the day and night. The automation will then interpolate between those in a nice curve.
Example:
It also allows you to set a maximum and minimum temperature, so you can have extended periods at the middle of the day/night with those. Example:
Note: It triggers on sun.elevation changes, so you may need to enable (and hide) that on the “Sun” integration. The sun’s elevation is not used, but I liked that trigger better than a dub “every 1 minute” one.
blueprint:
name: Day Cycle Temperature
description: Makes a climate controller's temperature follow the day cycle
domain: automation
input:
climate_controller:
name: Climate Controller
description: This climate controller's temperature will be synchronized with the day/night cycle.
selector:
target:
entity:
- domain: climate
base_temp:
name: Base temperature
description: The temperature at sunrise and sunset.
selector:
number:
min: 0
max: 100
step: 0.25
unit_of_measurement: "°C"
mode: slider
max_temp:
name: Maximum temperature
description: Hard limit for the temperature.
selector:
number:
min: 0
max: 100
step: 0.25
unit_of_measurement: "°C"
mode: slider
min_temp:
name: Minimum temperature
description: Hard limit for the temperature.
selector:
number:
min: 0
max: 100
step: 0.25
unit_of_measurement: "°C"
mode: slider
noon_temp:
name: Temperature at noon
description: The temperature in the middle of the day. (May be higher/lower than the maximum/minimum temperature.)
selector:
number:
min: 0
max: 100
step: 0.25
unit_of_measurement: "°C"
mode: slider
midnight_temp:
name: Temperature at midnight
description: The temperature in the middle of the night. (May be higher/lower than the maximum/minimum temperature.)
selector:
number:
min: 0
max: 100
step: 0.25
unit_of_measurement: "°C"
mode: slider
trigger:
- platform: state
entity_id:
- sensor.sun_solar_elevation
- platform: homeassistant
event: start
condition: []
action:
- variables:
dayt: !input noon_temp
nightt: !input midnight_temp
sett: !input base_temp
attday: "{{ dayt - sett }}"
attnight: "{{ nightt - sett }}"
maxt: !input max_temp
mint: !input min_temp
temp: >-
{% set sr = state_attr('sun.sun','next_rising')|as_timestamp - today_at()|as_timestamp %}
{% set sr = sr - [86400, 0][sr < 86400] %}
{% set ss = state_attr('sun.sun','next_setting')|as_timestamp - today_at()|as_timestamp %}
{% set ss = ss - [86400, 0][ss < 86400] %}
{% set n = now()|as_timestamp - today_at()|as_timestamp %}
{% set n = n + [0, 86400][n < sr] %}
{% set dl = ss - sr if ss > sr else 86400 - (sr - ss) %}
{% set se = ((-1, sin(pi * ((n - ss) / (dl - 86400), (n - sr) / dl)[ss > n > sr]), 1)|sort)[1] %}
{{ ((mint, [sett - se * attnight, sett + se * attday][se > 0], maxt)|sort)[1] }}
- service: climate.set_temperature
metadata: {}
data:
temperature: "{{temp}}"
target: !input climate_controller
mode: single
Thanks to @Troon for the math.