Do those in-cab air,internet,cable and phone systems save at the big stops?
as with everything there are trade off.
Idleaire, the newest service of anti idle is a government subsidized publicly traded company their rates are about 3.00 per hour.
there is a point where they are cheaper on the surface than idling in a cost per gallon per hour of diesel.
my C-15 Cat engine uses about 1.5 gallons per hour to idle so at current prices its a $6 vs. $3 per hour choice.
also there is the consideration of the emissions and the wear and tear of idling an engine that is $16,000.00 to rebuild.
the most noteworthy offset is that to setup the system you lose about 1/3rd of the parking, there's currently a 20,000 parking space deficiency now with restrictions tightening every day.
I use and APU mounted on my trucks so I have 5KW of 110 voltage, a/c, heating, battery monitoring and can use it for one pint of fuel .50 an hour