I recently replaced 30 tons of air conditioning in my home (6 units). My previous units where 14 Seer Trane units that where high tech at the time and very efficient. They had 3 stages of power to save energy.
The new units are 24 seer inverter heat pumps that are infinite number of stages as it scrolls up and down (like a CVVT). The interior fans are also infinite stage.
The end result is my power bill was cut drastically (45% in the summer months) comparing the July 2024 to the August 2024 bills. August was actually a hotter month, and I was home for more of the month, whereas I was gone all of July. During July the house was set to 76F, and August spent most of the month at 68F, with daily temperatures over 100F.
The point of all of this is that technology does exist to use less power and provide better cooling. The units on our RVs are about the oldest design possible and have no efficiency. Think about how Newmar has ducted the air. The intake and return are in the same place, separated by just a few inches.
If the return was placed on one side, and air was drawn across the room, it would provide better circulation, and require less run time and save energy.
The whole idea of CARB is to reduce the need for emissions, and by reducing the need for energy we can get there much faster.
I would like to see a bill that would make HVAC perform better and allow me to keep the coach 68F year round, no matter how many times the dog has to go out. And it would be an even better bill if the HVAC ratings specified that I could keep the blinds up to see the scenery.