i am very sorry - this approach makes no sense whatsoever for aircon. if you are talking about an inverter unit, then you must understand that the aircon can run at different consumption levels (in contrast to full power/off for old style). the usage of the inverter aircon is not in any way related to the temperature setting (unless you put an impossible to reach temp, then its always full power). the power will adjust according to what is needed to maintain the set temp level. so the better your place is insulated the less energy will be used to maintain ANY given reachable temperature. there is no "sweet spot" per se.

his proof is bogus too: if you put lower temp, then of course the a/c notices ambient temp is too high and it needs to work more (ie use more power) to reach the new target. put your AC to 29 and you will see it uses even less power.

which is why i said it will use even less power

Awakened_Angel,

"when usage is minium/stable,no saving will happen" is not really true. an inverter runs at higher efficiency levels (higher EER) on low load situations. i.e. if your inverter runs on low load it will outperform a regular aircon at all times. some dont hit the good EER on full load (most dont actually) and are best at at par with regular units. the key is that you need to use the inverter a/c on below full load situations. then you will permanently save for the entire duration you cool your room. so when usage is minimum is actually when savings happen.

its all about how is the EER at the current load. regular A/C is different its either fully on or totally off so the EER is always stable but EER can be better with inverter A/C

EER is a good indicatior for the electricity required to produce the same amount of cooling i'd say. but good that we are on the same page anyway

nope but you should not(!) buy an undersize inverter cause inverter will save significantly only in below max load conditions. so if you're inverter is running all the time on full load it doesnt make sense to have one.