DSK writes:

Jeff is right, current consumption from a
battery bank is commonly (and correctly) measured in in
amp-hours, and this is the important spec to most boaters.

Amp-hours is a unit of charge, and not a unit of current.

Charge is not current.

It is nonsensical to specify current in amp-hours. It is
like asking what gas mileage a car gets, and responding,
"18 gallons".

Of course people use the term "current" to mean a vague or
naive notion of "electricity", such as "house current".
But this doesn't excuse a technical specification giving
a bogus value in nonsensical units.

.... Amp-hours are not a measure
of current.

Also correct, but then nobody (except you) is stating such.

You just said, "current consumption ... correctly measured in amp-
hours".

"Vented freely" is a political, not a technical advantage.

It is a technical advantage if you are currently working on
the system.

You confuse "venting" with "freely". This is hopeless.

CO2 is lousy refrigerant for all but a few unusual applications

That may be true, but the fact is that it works.

Puhleeze. Anything compressible material "works". But it doesn't
"work" in the sense of being in any way practical.