First Of all you have to ask advise from air conditioning expert, making sure that its suites the location and AC application. ask friend and family about their feed back about the AC models and brands in the market.

Compare between the models and checking the Star efficiency rating for every air conditioner. along with the Warranty period and terms.

Cooling Capacity Needed calculation:

BTU= Length x width x height x 20

Example : room size 5m x 4m x 3m = 60 x 200 = 12000BTU (One Ton AC)