Brother no idea about that. I've mentioned my ACs brand, model and size. You may search further. What i have read is that T1, T2 and T3 denote the climatic conditions in which AC is to be operated. Sharing a post from other thread
https://www.pakwheels.com/forums/t/which-dc-inverter-ac-is-best-gree-or-kenwood/797599/24?u=zserfvd12
Kenwood Pakistan have designed ACs as per the climatic conditions of Pakistan and they claim that these operate even at 63 Degree Celsius (God Forbade). I have attached the snapshot of features, as claimed by Kenwood. Lastly i would add that don't go for the marketing gimmicks. There is hardly any regulatory or certification authority in our country and even if there was, you know how stuff works here. So your best bet is to opt for the brands that people around you or people you trust are recommending. 