I came to the conclusion that if i wouldn't take a picture of my AC unit area, and all the ducting i had going to it, it needed a makeover. It was ugly i admit. So after a revamp of the whole loft area above the closet in my grow room (that's where i house the 7K AC unit, see pic below), and also a rework of all the 4 inch flex-hosing throughout the room, i did some more testing today and found my AC is as i suspected, good to go and not losing my co2. What is though, i don't much know. Gonna need some more testing i guess. But i guess i lucked out and got the unit designed correctly. After all the reworking was done, what i did was, pump the room from 550ppm (ambient) to 2603ppm co2, came back in one hour, and it was down to 1761. I let it get to 550 again, then pumped it back to 2567 but this time turned the AC off before i left. In exactly one hour it was 1735, so no difference with or without the AC on. Well except it was way to hot to have done that test midday, lol
When i wasn't trying to contain co2 i would run a neg vac and pump out so much heat from up there, i never had an issue. With the carbon filter just scrubbing the room now, temp's are starting to piss me off. My ladies are tough, they can handle them, would even more so with 1500ppm of co2 24/7, but the sun is falling in the sky and that means hear shortly i'll get to add 6 hours of natural sunlight to my flowering ladies from a South facing window in my room, and with that comes even more heat. This really is the worst time of year coming up, if i can find a way to have my cake and eat it too, results will be amazing though.
I can see the benefit of a mini split now,get the hot part right the fuck out of the room, was looking at this 9K unit for $400, but wondering where to set the hot part of the unit. I'm in an apartment so i can't put it outside. Would one work in a hot attic loft crawl space? Lot of air to move up there, just real warm air. Thoughts?
So heres what i came up with for now with what i already have. BTW, that whole area behind the wood is like 71"x31"x 31" inches. So, best way to get air from outside the room, and cool the HID's and AC was from the HVAC vent i figured. I split it off into three 4" hoses, two short ones cool the area behind the AC, which vents into the attic. The long one you see runs to the two 400's, aluminum tape and zip ties sealing every connection along the way there and back. Gorilla tape sealing around the wood. I really don't see a leak anywhere. There are two 200 CFM inline fans in the pic also. One to the right of the AC on the bottom 4" hose, and the other is at the far left of the image on the other side of the HID's. It doesn't just dump into that space behind the AC unit though, its hot enough back there from the AC, i gave it its own hole into the attic behind the plywood. Might seem weird to use my homes AC to cool my grow rooms AC and HID's, but it works, all be it not as efficiently as id like.
I guess next i should test co2 loss with the homes AC off for an hour, than again with the two 200's off, and see if either of those appear to be the co2 robbers.