The main problem with heat(so Ive heard) is once temps hit a certain point the plant has a harder time taking up nutes as well as obviously drying out quicker needing more water. I use a Neslab water chiller/heater. Its made for labs but it works the same for hydro. I live in the south and temp reach into the 80's now and since the mother inlaw is coming the plants are up in the attic where temps reach right around 100F. I grow DWC. So I took the water chiller and have 1/2" tubing coming out of it. I then drilled holes in all the buckets lids/nets. I ran the tube into every buckets in a big loop. All the water chiller does is push cold water in a continus loop with out ever actually replacing the water in the res. But since cool water is running through the tube through each res it makes the res water cool. I keep the water res temp in the high 60's this way. Of course my water chiller is set to just above freezing though cause it looses alot of its cooling effect running the distance it has to through the warmer water in the res and the hot temp outside the res. I bought the chillers for my barn which Im gonna be growing in. There is AC in part of it but it still gets HOT back there. But Im going to be setting up a different hydro system, for the chillers to be more effective, possibly a recirculating DWC or something.
