my air cond guy charge me RM3000 to conceal piping work for 2x2HP inverter and 3x1HP inverter air cond .

but im not going to install my air cond 1st and ask him to deduct out the installation fee. he said will onli deduct out RM500..
is it reasonable?

It is 5 of them

my aircond installer charged me RM200 each aircond for the conceal work (including cementing back the hacked wall).

the conceal length for each aircond is about 10 ft.

price v cheap le..workmanship ok onot?

so u let ur main con to conceal for the 2 air cond piping?

Is RM 800 to lay copper piping about 20ft. Is that ok?

1.5 HP - How? Bocz it comes down about 6ft then to the outside another 12 ft

yup that is the plan

1.0HP is back to back onli? for my 2 small room i put 1HP, both room got their own toilet, so i put on top of the toilet's door, so got more hacking work thr..

Yup i using 1.5 HP Panasonic (Non Inverter type)

my small room cant put back to back, else i save a lot d...cos thr is a beam thr..so no place to fit in the indoor unit thr......

I guess I look like a water fish to the contractor, below is the conversation between him and I:
C: how's your consideration of the offer?
I: I will engage other contractor to do the work for me.
C: why?
I: the price is quite high.
C: I propose that you installs back to back, I can re quote accordingly.
I: no need already.
C: May be we can negotiate the price.
I: no need already la. You cannot compete one.
C: how much is the offer?
I: 4 to 5k like that lor.
C: 4k impossible la, 5k plus may be can do la (WTF, want to cheat 3k at least on the first quote)
I: WA... Two to there k different wor....  
C: previously what I quote is Hitachi brand piping, the highest end for the air con piping, may be we can use the middle range piping.
I: no need already la, I decided to install after I get the key.
C: don't decide first, let's compare the price, you give me his quotation then may be I can quote you cheaper leh, but you must let me installs for you la... Some more if do it later the finishing not nice one. (cilaka, can't cheat me this time and think of cheat me next time)
I: ok la, let's see how la... (impossible to let him do the work, big buaya)
C: ok, thanks

So guys, get more information from the forumers here, at least you have the bullets to nego with the contractor.

Guys.. ask ur opinion..

2 contractors quoted me different price.
(inverter type + conceal 0.61mm copper + conceal pvc drain pipe + hacking)

items:
2hpX1
1.5hpX3

1. one quote me . 2.3k lump sum
2. another one quote me . 3k lump sum (certified air con installer)

1st guy refused to give me a quotation list. Said he have a lot of experience installing air-con. 14 years. Recommended by the shop that I bought air con from.

2nd guy is a certified air con installer. Normally did those high rise buildings. He only recommend best of the best material. Initially he quote me 4.2k for everything. He include insurance coverage in the bill as well. He will later breakdown the cost and air con installation diagram to me. He told me their way of doin stuff are totally diff than uncertified installer. They follow strict guideline from those association. If wrong, they may lose their license. Means ada standard.

Now, I need to choose. In dilemma now.

My contractor told me no need to do piping first for back to back installation. He said the aircond people will do the piping together during installation and this can be done easily. Is it true?

For Daikin, inverter, R410A gas.
My aircond contractor quoted me the following.

To lay copper pipe and water drain pipe, WITHOUT conceal into wall:

1hp @ RM 500 x 3 = RM 1500
2hp @ RM 570 x 3 = RM 1710

Installation only,
RM 200 x 6 = RM 1200

TOTAL: RM 4410

Is the price reasonable? It's a double-storey house.