Hello Windy,
I'm in the same situration.
I just got a ground-heating system, that I'm integrating into Homeassistant, and I want to add weather forcast data into HA, in order to optimize the heating system.
The data I'm specifically looking for, is wind direction, avg. wind speed, expected gust speeds and expected temperatures.
My current guess is that I need a 48h forecast in order for it to be helpfull.
the reason for the wind-direction is that if we have 30m/s from north or east, then it doesn't affect me, heating wise, but if it's from south-west, then we need substancial more heating
/Ejdesgaard