IT'S NOT AS BAD AS YOU THINK.....
I only run Analog A/C units. Mostly Old and some Vintage, which I'm looking for more. I have never had any appreciable increase in the electric bill because of using an old A/C. Like Old refrigerators, the old A/C's cycle less than the new ones. The new one have to run the compressor longer and for more cycles to keep a room cool.
The new Digital A/C's will never cool a room below 60degrees, which on a 95-100 degree day may not feel like enough. An old A/C will keep cooling and cooling and for all intents and purposes, will cycle the compressor off to keep from freezing up when on the coldest setting.
Put a thermometer in your vehicles A/C duct. An Auto-Temp can only be set to the lowest temp of 60degrees. The Duct Outlet temp is usually 42-45degrees.
On a Manual/Conventional Vehicle A/C system you set it to the Coldest/Max setting of the blue range, and I have gotten 34degrees at the duct on my Ford with 134 refrigerant.
It really is a matter of what someone is more comfortable with. The Vintage A/C's that are around still work great, while alot of the Newer Digital ones have died w/in 5-10 years.
I'm sticking with Vintage A/C's.
BTW....I'M LOOKING FOR A 50s, EARLY 60'S FEDDER w/THE CIRCULAR AIR VENT -- \
CIRCLE of AIR model. PLEASE KEEP AN EYE OUT FOR ME. THANKS
BEST WASHES TO ALL.