Which smart home system is suitable for our new building?

you understood me regarding the switches and access points

Should I do it like this or just connect the access point and switch in the rooms to power?

You have to decide that, both will work.

But that's exactly what I mean.
You are asking questions here where you usually get different answers because there are various options that all work. In the end, you have to know what you want. :p

Do the LAN ports on the PoE switch always consume power even when they are not in use?

No.

No.

Not the ports, but usually the larger switch. Larger boards, processors, power supplies, etc., so I would rather say yes. ;-)

Not the ports, but usually the bigger switch.
Larger boards, processors, power supplies, etc., so I would rather say yes. ;-)

If you calculate so pedantically, okay. But without knowing it for sure, I would claim that we are talking about a few euros per year here.
Besides, that wasn't his question :p

You just have to differentiate. Every power supply consumes electricity. Small switches consume around 15 watts each. A large one about 20 watts. Yes, the large one runs 24/7, the small ones do not, but the small ones also have to be made switchable again.

You just have to weigh and calculate as always. What fits better.

He currently needs 7 watts with a few active ports.

... and, when calculated over the year, that's already about 60 kWh.

Do only the poe switches need that much power or a switch in general?