58 minutes ago, bankruatsteve said:

First of all, inverter ACs only run at "full speed" a relatively short period of time - usually just after start-up.  There is no reason to run at "full speed" once the coolant is doing its thing.  The major savings is running the compressor at lower speed and avoiding the constant start/stop of the old-style which result in large spikes in current.  The 30% less energy comes from numerous tests by the industry and validated by TV posters who have taken the time to evaluate.  

 

But, this type of discussion is really becoming nonsensical as it won't be long, if not already, that the old-style aircon is just not produced.  

You the provider of the nonsensical you believe the hype. Ive got 5 and they dont save that much

And at this point our OP has his answer and we have degenerated into off-topic bickering.