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.