Tested all of them in depth, so talking about personal experience.
T3 inverter consumes less power than T1 inverter in real. Most of them have actually not yet seen a T3 inverter functioning, so all they keep commenting is their own theories to justify their T1 bad decisions.
When manufacturers itself claims that T1 has not been designed for such harsh climate over 43C, how can they even defend it putting it on 52C region? This is something i fail to understand.
You can keep it on 24C or even 22C at scorching heat and even then it will maintain at 3-4A, which is not the case with T1 inverters. And what you have is R22 model, R410a T3 inverter will be even more efficient.
Most of my family members use T3 Inverters and they noticed further reduction in bills over their old T1 inverters, even with daytime and heavy usage. All of them stay at 2-4A max on ~45C weather on 24-26C.