My pricing is based on inverter a/c piping, concealing and plastering:
1. 1HP Split A/C - RM18.00
2. 1.5HP Split A/C - RM20.00
3. 2HP Split A/C - RM22.00

IF non inverter, I think is RM2 - 3 lesser than the inverter. He also gave a round up discounts on A/C installation (price below RM90 per unit, regardless of the HP).

Sorry, the pricing is based on per feet.
1. 1HP Split A/C - RM18.00 per ft
2. 1.5HP Split A/C - RM20.00 per ft
3. 2HP Split A/C - RM22.00 per ft

Yes, it's conceal and the contractor plastered as well. I didn't know whether there is any minimum distance, but I just got quoted on the spot. Took him 2 days to complete the job.

The workmanship is fine, noticed all the pipe was directed to the gutter. No complaints on the plastering job as well.

My contractor proposed a lump sum inclusive the air-cond installation. I did 7 rooms, and the cost is RM2.1++K, and then installed 4 a/c ( 1 unit of 2HP Non-Inverter, 1 unit of 1.5HP Inverter and 2 units of 1HP Inverter), he lumped it at RM2.5K for everything.