Thanks for your suggestion.
Is there any reason why it is not recommended for York?
It looks cold enough to me.

1) possible
2) Plaster ceiling can be "re-patched" after the job done, not much an issue.
3) No contract will want/dare to drill through a beam, so you need to round it.

You need to check properly in term of load capability of wire and your total loop of the wire, from the point that wish to pull/loop for the air-cond if decided not using directly from the DB.

As even you see is just a plug point, sometimes there is plenty of loop sharing the same supply behind that you do not see.

And also, the rating of the wire pulled original that can carry how much load (A).

Easy way to check, is off the Circuit breaker in the DB, see how many point do not have current, then already know how many loop has been applied on the single pull of wire.

That's because of minute particles like brake pads and combustion engine emissions soot from vehicles or diesel generators. See here. This one is best helped by appliances that deals with indoor air quality. Also air cond if on should be around 26-27 with 1 speed stand/ceiling fan. If cooling room, pre-cool it to AUTO 24-25 deg then when sleeping set it to AUTO at 26-27 and time it to turn off say btw 4-6am. The goal is to maintain humidity that's not too dry for the nose. 26-27 degrees Celsius doesn't produce too dry air. Otherwise put a basin of water in the room or invest in those air purifier that uses water to trap the excessive dust particles like Venta or Stadler Form Robert.

Why not sure ? I live there of cos i knw the usage pattern . I have 9 in total but sometimes i need to on 6 . But that is not my question.

i wanto install cassette 2.5hp or 3hp for 2 units for my living and dinning hall . But my installer told me there are one phase and three phase compressor and advised me to choose for three phase for effiency and more electricity saving .

Thanks bro. I will call them and check.

Yes. I always have the Econavi on. There will be a blue light at the aircon.
So i should off that?