That A/C has an EER - cooling of 3,24; i.e. 1kW of electrical energy will "destroy" 3.24kW of heat.
Interesting. I didn't know they rated them like that.
For the rigs I'd either move it to a non-AC location and vent outside or build a light enclosure, maybe even out of cardboard, to surround them and vent outside.
I don't have to do that because here (in Thailand) I don't have AC and the temperature outside and inside are usually close: 30-32C in the day, and 27-29 at night. With Sapphire 5830 cards I've found that the coolers warm the air by 5-7C and my core temps stay around 68-70C with varying the fans from 55%-60%.
At todays btc prices it just doesn't make sense to cool with AC.