u/Friendly-Horse-4104

We are changing the ACs in our villa and would really appreciate your advice

1. Carrier or O General?
2. GI ducts or Pre-insulated phenolic ducts? Previous ducts had mold growing, especially in areas where the duct surface was not smooth
3. If GI ducts, whats the best type of internal sound insulation material? Previous ducts had rockwool sound insulation that all fell apart and were blowing harmful particles everywhere
4. If GI ducts, whats the best type of external thermal insulation?

These are ducted split ACs (with outdoor unit on the roof and indoor FCU in the ceiling, so no central chilled water system if it’s relevant).

Appreciate your advice on the above and any other suggestions!!!