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Mitsubishi is a very good brand. There is a large Mitsubishi HVAC manufacturing facility here in Georgia, near Atlanta/Marietta. One of my co-instructors at the Technical College where I taught HVACR for 26 years worked there and would give special training classes at the college on the ductless mini-split systems, because they are so different from what we know as traditional HVAC systems.

I would say that most HVAC service techs here in the US, who have been trained on traditional HVAC systems, may not have the proper skills needed to service and repair the ductless mini-splits. On the other hand, they are very reliable and rarely break down, but nothing is infallible.

If you can adjust the direction of the airflow on your mini-split air handler unit in your piano room by making adjustments using the remote control, or moving the internal louvers inside the the unit itself, that would likely solve your problem. I will add, however, those units are so technologically sophisticated and computerized, I would not recommend any manual alteration of the units function, other than with the unit itself. That air handler has to breath, in that it has a return inlet and a supply outlet. If you do install any kind of diverter, make sure it doesn't affect the units operation or block the airflow in any way.

All the best!

Rick

Jojovan, can I ask you - do you run the aircon unit all the time, or is it only on at particular times?

On particular timing only, not all day. ^^

On particular timing only, not all day. ^^

Jojovan, I am concerned about another potential problem here. Singapore is hot and humid, so presumably when you don't run the aircon unit it will be hot and humid in the apartment. The aircon not only cools the air, it also extracts water vapour and so lowers the humidity. Therefore, it seems to me that you will have continual substantial variations of humidity when you turn the unit on and off - which is exactly what pianos don't like. It may be of course that the humidity variations are too small to cause concern - or that the on/off periods are too short for the wood in the piano to acquire or release much moisture. But I thought I should flag up a concern, and hopefully other people will comment on this aspect.

Perhaps a Dampp Chaser would help to address this problem.

If due to inevitable reason that a piano (already have the heater inside) have to face the aircon vent, besides
1) turning the vent direction away
2) lowering the wind speed
3) lower the frequency of switching on the aircon

How would you further advise to protect the piano? E.g buying any device or special cover for piano helps?

Thanks