Depend on the brand and the gas they use. It is not about the inverter.

If that brand use normal gas r22 but inverter, the piping is normal only. While if that brand use r410 gas but inverter, than the pipe is bigger.

Last time my inverter aircon con seal installation is about your price too. The work is same. I guess the price is reasonable.

If you put your hand on the wall where the water pipe is, you can feel it cooler than others wall. That is how the wall get moisture. Specially if the conceal pipe is just at the wall surface. Not deep enough.

I got to use primer paint to paint first. Than apply the actual paint. If not, the paint will fade away.

Yes. Very obvious. Cause at first I just use maxilite white as undercoat. Than ici pentalite ontop of it.

No worry. This thing can be solve easily.

It call insulation that prevent hot or cold from escape. My pvc drain pipe don't have this kind of wrap. I believe many didn't do that too. The aircon side short drain pipe should have this insulation.

Decorate it with some leaf and flower.

1 thing I don't understand is, for old practice, I see they separate the return hot gas copper pipe from the insulate cold gas copper pipe. For logic, it is correct way.

But nowaday, the hot and the cold copper pipe is insulate together. The hot gas pipe is insulate for what? It should disipate the heat out not to insulate the heat. I try to ask them, but can't give me the answer.

Each brand have it own spec. Check the manual. It sure got write the pipe distance and max height between indoor and outdoor unit.

The crack layer is quite thick. If this beam is horizontal to your house, better check properly.

Why can't just hack the vertical wall and go through by the vertical wall ? 1 hole instead of 2 hole.

You can just silicon seal the hole. But there is 1 problem. After some yrs, the insulation will start to crack due to expose to sun. (if that area is outside) And the leaking will start.

The black insulation that cover the pipe is a foam. It is soft and cannot stand to UV expose for many yrs. It will brittle and start to crack. The rain water is staying on the ground and not flowing fast away. If the pipe from the vertical wall, than the rain not easily sip in.

You need to do additional thing to secure the water from leak in. Anyway the leak won't be that fast. Silicon + water proof paint can last longer. Very much depend on your skill.

Actually for piping this way, there is a proper way to open the hole .

Can la. Got some silicon that can paint. Brand bostead if not mistaken. Than paint it with PYE flexi seal. The whole insulation need to be paint also.

Definitely after some yrs.

It depend how the installer run the piping and to where the outdoor unit place.

You still need to conceal it after the piping comeout from the plaster ceiling. And terminate at the aircon.

But piping inside the plaster ceiling don't need to be conceal. It is like no logic and cost you more to hide the piping inside the wall. While the piping can't be see inside the plaster ceiling.

But 1 thing must be take note is the piping must be insulated properly without any pipe expose. Cause the condensation water will drip down to the plaster ceiling and spoil it. Later you can see some watermark on it.