It should be great if in the future HA will supported 100% one brand of air conditioning. For example LG, that have LG SmartThinQ system for all the products and there is an API documentation:
The same for an Ambient Weather Station brand.
Well you have already some solutions like Coolmaster that allows you to integrate at 100% existing AC systems (VRV or Split) and that is universal. I have Coolmaster system installed at two of my customers and it works perfect with HA, I have control of thermostat temperature requested, ambient temperature as measured by AC, fan mode, dry air mode… 
Thanks! 
i’m gonna study Coolmaster system…
for the weather station i have foud this tutorial:
You’ll end up with a card like that for each zone (AC in maintenance for now at that customer so no data displayed ;):
Setup of it is very simple as you just connect the 2/3 bus wires depending of AC manufacturer on Coolmaster (setup for correct manufacturer), you setup an IP in it using the touchdisplay and add integration in HA and you are done 
Only drawback is price but it works really well so it’s price of quality 
For weather station you posted wrong link 
Actually, an midea based AC/fan can do this with the use if a ESPHome module 
There is already a thinq integration, although it is a custom component.