The way my HVAC guy explained it to me in layman's terms is this. On an air conditioner, the refrigerant should be boiling somewhere around 50°F, maybe just below. So the air coming off the system, if everything is working right, should be within 10° above that. That's the lowest temperature any air is ever going to get with this system; you can't cool air below the temperature of the refrigerant, or even to that temperature, since physics just won't let us have 100% efficiency. That's why AC systems are rated not in BTU but cubic feet, the amount of air they can move in a given time. Since you can't add a small amount of super cold air to cool a space (like putting an ice cube in a glass,) being limited to air somewhere approaching 60°F, you need to keep turning over the entire volume of air in the space you are cooling. So there's a limit to the lowest theoretical ambient temperature a given unit can achieve, and a limit to how much space it can achieve that in. Any product or hack claiming to beat this seems too good to be true. An air conditioner is just not a refrigerator. Bob, do I have that right?