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I have experience with split systems in commercial office applications.
The benefits are efficiency and individual zone (room) control. What are the reasons your architect is selling you on them? Does he get a commission from the distributor? Ask him.
The architect can and likely has done the calculations to size the units to adequately cool the zones. If you doubt this then find another architect because this is an entry level calculation.
Tubes for refrigerant are insulated.
We prefer Mitsubishi, with Bosch a second choice.
Noice is different. I have been able to hear central forced air AC units in all houses I have lived in. Some quite loud in fact with booming duct sheet metal. Split systems will have a different sound as compared to a central force air system. Whether it is better or worse is your call. I don’t mind the sound of a split system.
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