I wish I could duct the a/c into the contained growshelf and just cool that. It would save some money (luckily electricity is cheap here though) and it would probably even drop the temp down. I've measured the air coming out of the a/c at 52F. But my one problem is this: Id have to control it with a thermostat set inside the chamber. Unfortunately, when power is interupted to this a/c unit, it defaults to a temp of 75F. I set what temp I want on the a/c, and it cycles off and on to maintain it. To control it from an outside source, ie from a thermostat inside the chamber, would cause is set itself to 75f the next time it came on. So unless the temp of the air at the unit itself was above 75, it wouldn't cool the air despite the temp of the thermostat inside the chamber.
SO - moral of the story for any of you that might be considering using ducted a/c air: Make sure that it doesn't default/reset itself upon power interruption. I know there are units out there that don't reset themselves (I cannnot remember what this feature is called) so you can set it to the lowest temp. This would cause it to actually cool the air with power supplied. You will pay more for them. Or, maybe there are units that are simply on or off, with no temp control. That would work well also for an external thermostat to control it. I originally bought this unit many years ago before deciding to put it to work for this purpose, so for now it makes do.