5000btu is equal to 2 HP, and the recommended chiller for my res size is 1/10HP. Are you talking about the evaporator of the AC being IN the water, or just the cold air blowing into the tent?
i have a 12x12x7 room......with 3 tents 3x3x5 drying tent 4x4x6 veggie and 5x5x6 flower ........the ac was in the only window in the room pushed to one side giving me 14 inches to make a exhaust point with some plywood (the room has been sealed with polywrap and IR blocker on the ceiling ) only point of air flow is tho the door that has a 12x12 inch hole with a 500 cfm 12 inch fan installed into .....the exhaust was a 240cfm veggie and about 300cfm for flower (2 powered intakes for the tent a about 220 cfm each )
i had the ac full blasted set to 68 degrees(settings at 60 68 is the lowest it would hold) .......running a 600w veggie cool tube and a 1000w flower cool tube (hood i linked u) because i was running it so much and hard i had to get a 2 breaker for the room to handle the power .......it was barely keeping my tops under 80 F (at 80 F THC degrades faster ) i was running a 10 degree but when the temp got to be only a 6/4 degree different i was get to 86 in the tent and leaves showing heat stress
in the tent i have a 6 inch fan that moves to cover the tops and the powered intake allows me to direct the air under the fan so greater cooling of the leaves
i am east coast .........when the temps outside got above 90 the room was in trouble ........it was the only reason i did not start Rdwc i already had a fail in the test dwc to see if the temps were steady enough to run a hydro .......a 6000 btu was to weak it destoried the bush that has been growing about 8 inches in front of the window fried the whole top
just so u have a full understanding .........the house is a 2 lvls with the 1st 40% under ground on 2 side (where the tents are) ...the house has central AC(set for 72) the room it is in has no vents but the hallway that the door is in links to a room with 2 vents and a fireplace (currently the fireplace is my intake vent....as the AC vents are closed and sealed off ) summer time i reverse close the fireplace off and open the Ac vents .........the house is in a yard with several large trees that shade it most of the day about 6 hours of direct light hits roof.......the room the air comes from has no direct light windows blacked out
i took advantage of every possible fact i could to control temps ........thinking that i would not need a powerful AC like with HIDs ..........i tried everything i could think of and more there are work arounds but they require more effort time and energy to do the work (i am a redneck jerry rigging is a way of life)
i am telling u what i know out of the fact good karma saves my ass on nearly a daily base......that what i had and what i did it did not work ..........the investment in it now will save u about 3 months of head aches and freak outs with low returns