That is normal rate for 1hp for back to back. If your indoor unit located far from outdoor unit then of course need to add extra.

1. Aircond hp
2. Inverter or not
3. type of house 1st floor 2nd floor condo
4. Wiring ready or not or need to add power point
5. Wiring want to conceal or not

If your aircond 1hp want to install on 1st floor back to back or condo with reasonable ledge and use available power socket.... then RM250 is the max. Don't worry.

This post has been edited by gogocan: May 15 2020, 12:36 PM

Then RM 250 is the max. I never need to pay more than 200 for 1hp installation..the max I installed is RM 350 for 2.5hp inverter back to back.