What is a good brand for ceiling type aircon these days? Panasonic, Carrier, Koppel, Kolin? Need 5-6 tons 3-phase ceiling mounted aircon. We are going to replace Panasonic 15 year old 5 ton ceiling type aircons. Currently have 6 units, intend to replace 2-3 initially. Carrier is the more expensive one, Koppel seems to have quality issues a decade ago, how is it doing now? Panasonic is in between. No idea on Kolin quality or pricing. Please give suggestions. Thank you.