And make sure they install the right piping. If not it will cost you further down the road. Need to change the whole pipe again, costly.
RM200-250 for 1st installation sounds about right if the piping isn't so long between indoor and outdoor unit. Total distance can sum up quite fast once you start measuring.

For example :
- 1hp vs 1.5hp vs 2.0hp pipes
- Non-inverter vs Inverter

Piping must use recommended AC pipes size/dimension stated in the manual for best cooling. Else, you might suffer less cool and coolant leaking.
After 1 to 2 weeks of installation you don't feel cool like before, then something is wrong with the piping. Just my experience.

This post has been edited by mmohdnor: May 15 2020, 12:20 PM