A sensor entity is read-only; it has no service call for setting its value.
In contrast, a climate entity (what’s produced by the Generic Thermostat integration) has several service calls including one for setting its target temperature.
I have no experience with the IHC Controller integration but, based on its documentation, it has several service calls including this one:
It allows you to set the (floating point) value of an IHC resource based on its ihc_id.
For example, assuming the resource’s ihc_id is 12345 you can set its value to 21.5 like this:
- service: ihc.set_runtime_value_float
data:
ihc_id: 12345
value: 21.5