Can Home Assistant be a thermostats like nest?

Hello. I have A/C, thermofloor and convector. I would love to set 1 temperature and Home Assistant to control everything. I know that there should be special algorithm witch would choose what to turn on/off first and what to do later. Seem’s to be unreal for automating on yaml + I do not have needed knowledge for algorithm.

How should it be done?

If you got a On/Off boiler or heater you could use a relay with an ESP chip and the generic thermostat integration. Its relatively easy to do so, I’ve made a instruction how to do this below

You can also have a look at Schedy for advanced scheduling (like most thermostats can).

This is going to be specific to your own house and climate devices. It is impossible for Home assistant to to cover all permutations. How many people have this specific set up?

How many people have ducted heating, split system A/C units, swamp coolers, hydronic heating… the list is almost endless.

You are going to have to learn. Start small and build up.