Back when the new A/C gas transition occurred, I remember all the horror stories from 'experts' about how poor the new A/C systems would work due to all sorts of thermodynamic reasons. No way around it, just suck it up and live with it.
Instead we find that they work just as good and in the case of home units, using up to 10X less energy for BTU moved from the old units.
That's the trouble with high tech, to make personal and policy decisions we have to believe the experts whether it is about global warming, wind power, world over population, ethanol, sustainable whatever, etc.
They don't often get it right the first time. Trouble is an A/C success like this leads the policy makers to assume there is a technology or engineering solution to everything. At some point of diminishing returns, increasing the mileage of cars again and again and reducing tailpipe pollution to negligible levels will come with unforeseen consequences.