Unfortunately I'm not a big drinker, but I can always stock up 
It doesn’t seem to raise the temps in the bedroom that the grow room is in much if at all, as long as you have a decent draft going past the condenser and it can’t vent into the bedroom the only heat you’ll get from the a/c unit is what radiates off the ductwork going to the window. And yes just a cheepo in-line booster unit works plenty as long as it’s on the exhaust side pulling air thru rather than the intake pushing the air thru, less loss of airflow.. I’d love to be able to start using co2 but my room isn’t quite dialed in yet to where co2 will benefit me much if at all. At some point in the near future though, I’d love to get an arduino or a Pi to tinker with and setup a live PH monitor and option to adjust my PH remotely, and eventually, would love to have it soo my nutrient changes can be done remotely as well, maybe. I’m not sure how much I’d want to rely on a computer being able to tend to my plants or not dumping over 40 gallons of water into my house. The PH adjusting I would be a little more comfortable with however.
I have however ordered a ph test pen from China, but it's apparently on the slow boat, its been over 2 months now...
Yes this is how I was trying to explain how I was doing my cooling, and after reading the thread you posted I’m going to change the direction of my airflow to see the results, although that won’t be till mid summer that I need my AC. And yeah I use a home built undercurrent system, PH can fluctuate a lot faster with hydro than soil, I’ve had it fluctuate from 6.4 down to 5.5 in one day when it was close to a nutrient change before as the plants drink more food the ph changes sometimes rapidly, my girls usually drink 20-25 gallons a week in flowering during their stretch, soo to me PH is a big deal, I used to have a $100 blue lab pen but it failed multiple times and seemed to have lots of trouble keeping a calibration, I upgraded to a lab grade Hanna handheld meter with a probe that can be left in the water, much much more accurate although with a $250 price tag I’d hope so haha. And this probe unscrews soo if I wanted to tie it into a automated system I’d just need to get the plug for it and has temp and ppm/ec readingsOk, now I got it, your A/C unit is mounted in an interior wall, as if it were an outside window. Cooling the condenser draws air from that external room, and blows the heat out the back (into the external room), however, you have captured that hot air and vented it outside. Now your comments make more sense to me, sorry...
All the hydro guys seem obsessed with ph, unfortunately you can't get cheap ph sensors that can be used in automation, they all seem to be expensive industrial units. Myself, I grow in soil, and have never even checked ph
As for watering, yeah, that's a lot of water, and here I am concerned about a gallon at a time...
Here's the I2C WaterDepth Module, mounted on top of the bucket...
The wood has small blocks glued to it to hold it in place against the lip of the bucket, don't want it falling in the water
I just mounted the Arduino Pro/Mini on the end of the board, and you can see the I2C wire on the left, the Ultrasonic sensor is mounted dead center in the middle of the bucket, and the small blocks will make sure it stays there... The visible pins on the arduino are for programming if needed, otherwise it gets it's power from the I2C bus...
Now to add the water pumps, then some water...
