Same here.I dunno about ph nor any potential caustic chemical issues with that runoff water, but I do know this much: The vegetation (grass, weeds, random) beneath my window unit ACs is always lush, green, and thriving. There happens to be a cactus feeding off that runoff right now, and it thrives and blooms brilliant yellow blossoms.
Take from that what you will!
CORRECT!It's just condensed water from the air. It'll be close to distilled water. Fine for growing (but you need to also add calmag).