Well the answer to that will be very elaborate.
But I just will draw the point to simple observations:
1. Take a normal AC. Set it at 15 deg C.
2. The compressor will work continuously in order to try to bring the temperature of air down to 15 deg C
3. Since it is extraordinarily difficult to do so, the compressor will keep running 100% of times
4. Even if it does reach 15 deg C, the heat influx into the room (via sun, electrical appliance, living creatures, heat conduction via walls) will not allow the compressor to breathe easy ever, since as soon as compressor switches off, the heat influx will cause a rapid rise in temperature - wherefore the compressor will have to switch on again in a very short time.
The exact same will happen for an inverter AC. No matter what sales pitch someone gives. No matter how high end the control technology is (the inverter module).
It will have to keep running at 100% duty since thermodynamics are not changed. (The compressor has to do the same work to remove the same heat). It will never get a chance to run at reduced duty load.
Now for the contrast:
1. Take a normal AC, set it to something high say 27 deg C
2. The compressor will work continuously for a few minutes (or hours - depending on the tonnage) in order to try to bring the temp down to 27 deg C
3. Since it is quite easy to do so, the compressor will switch off once it reaches this temp
4. Since there is some heat flow into the room, the compressor will have to switch on regularly after some time in order to maintain the temp at 27 deg C. The compressor up-time would be around say 50%.
For inverter AC, (1) and (2) will happen in the exact same fashion. BUT for point (3) and (4), it will not switch off. And neither will it do the switch on- switch off circus to maintain the temperature. What inverter AC will do is to cut down on its compressor duty by 50%. (So in effect your 1 Ton AC will start acting like a 0.5Ton AC now). It does so to perfectly match the heat influx. This allows it to maintain the temperature within a tight tolerance range.
Please note I have just taken 50% duty
arbitrarily, the inverter control will try to run the compressor at whatever duty that is necessary to achieve the temperature set point.
Inverter technology is a control technology.
It doesn't change ANYTHING about the refrigeration cycle (the compressor, expansion valve, condenser coils, evaporation coil)
It doesn't change ANYTHING about the fluid flow mechanism (the condenser blower, the evaporator fan),
and therefore it changes NOTHING about the heat transfer coefficients - which in turn dictate how much heat transferred/removed and how fast
So bashing quite a few myths:
1. Inverter AC are not faster in cooling
2. Inverter AC of 1.2T is NOT equal to Normal AC of 1.5T
3. Inverter AC will NOT lead to extraordinary savings of electricity. (Running 1 T normal AC for 50% of time
= Running inverter AC at 50% of 1T load).
What inverter AC does is achieve a fine temperature control, when it is at high temperature range. If you desire to keep very low temperature, then get a super high tonnage AC, and then bother to get Inverter controls on it.