If daily usage is less than 3 hours, then just keep it. If more than 8 hours can consider replacement as you can recoup ac cost with electricity savings.

Depends on your usage la.. and how you use them.

A/C only give max savings when you have temp set at 25~26C. My room A/C 8 hours daily (longer if weekend) consume about 80kwh while my son room also 8 hours daily consume about 60kwh (his room is slightly smaller). One is LG 1hp and another is Samsung 1hp.

Also this comparison is only valid for older vs newer refrigerant A/C aka R410a vs R32. I think comparison between older R32 vs newer R32 A/C would yield slightly less savings.

Bro,

If you are the type who want ice cool A/C, then inverter will not do a thing. Still you would still benefit from the power saving that was introduced with newer tech. If your old A/C still had the energy rating sticker, you can check the KWH rating. Some older 1hp (Im using my mom 1hp panasonic inverter A/C from 8 years ago) even with 5 stars consume almost 1500watts per hour versus newer 5 stars A/C which is also 5 stars but rated to use about 800watts per hour (my samsung 1hp windfree).

that means 1hr at full power would consume almost 2.46kwh