Which manufacturer makes the best air conditioner?

 The best according to the experience of the Japanese industry then the US and then the Korean

I cannot realy say which manufacturer is the best because here in South Africa we use Dunham Bush, Carrier, LG, Samsung and a lot of other types and to me it depends on how you maintain your unit how long it will give you proper service.

I think Trane , Carrier & York                          

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Mitsubishi

SKM

this is very general question

normally Carrier Trane York are good for Chillers, ahu and fcus

DX Split unit carrier york daikin LG

window 

Carrier York Generl LG

Hope this work

DAIKIN, CARRIER, GENERAL, PANOSONIC, YORK, SHARP, BLUE STAR AND VOLTAS.