There are several DIY homemade chiller threads on this site. I really believe it si possible to reduce the reservoir water's temperature other ways. I got a friend who made a DRIP of a frozen gallon jub of water and ti just feeds into his tank, into a hose or tube.
And look at Dystopis's post:
Originally Posted by Roseman
Temperatures, Humidity
https://www.rollitup.org/hydroponics-aeroponics/206613-temperatures-humidity.html#post2649262
What about one of the other Kush's? Looking for that knock you on you ass high? Maybe an afghan/kush cross.