12vdc AC Compressor on Amazon, Looks interesting if you have an alternator to run it. Options

[Steve]

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Just add Under Dash Evaporator, Condenser and dryer!
Example install, but mine is a Benling

[technicalninja]

Your automotive AC system sees the highest hi side pressures stopped at idle.

The system is the least effective below 1500 rpm with no movement created airflow over the condenser.

On a 110-degree day a 134 system might see 270psi at idle stopped 700rpm.
That same system at 2000rpm and 50 mph will have a high side below 150psi.

That's 3x the RPM but 60% of the pressure. Airflow is EVERYTHING!

A well-designed system might be as low as 120 on the high side and this equates into less HP being required to turn the compressor. Our 06 Odyssey runs like this on stupid hot days.

Now, the point of the highest load for an AC system is also the point of the lowest output from an alternator. Most alternators have a "thermal cut in speed" that you are supposed to be ABOVE to do load (output) tests. This is commonly 1600-2000 RPM.

I believe the reduced output from the alternator at the same time the compressor requires the most energy will be a problem for a 12v compressor. One temporary solution might be excess battery capacity but I am VERY interested in how well Clay's set up will work stuck by the Cresson train for a half hour on a 110 day.

I have recently replaced an interesting condenser. A 2016 Explorer Ecoboost uses two stacked condensers in series to reduce height to allow room for an intercooler.
The thickness of the stacked cores is 2" the width is 27" and the height is 12".
This condenser cooled a BLACK midsized SUV faster than anything else I have tested this season. This critter ROCKS!
It's too wide to fit in a 914 condenser housing but it was cooling a vehicle that has 5-8 times the interior space and it did it fast...
I'm going to try stacking two skinny parallel flow cores together in my housing. I think it will work great.