When I first started having the problems that high rez temps cause I used the frozen bottles but could not keep up with them thawing due to work and then I broke down and bought a chiller. I love my chiller, I set it on 70 F in the winter and when it gets hot I turn it down to 65 F to help with the 80 F that my closet gets up to.
I am hydro and I use synthetic nutes but I do add a beneficial tea that I know the nutes start killing as soon as I put it in there but I add a little more every other day to keep it going.
I have been growing for 4 years and as I am still learning and this is just my opinion but I can say without a doubt that I would no longer be growing if I had not figured out the tea and the chiller. Once I started using these 2 things plus lots of good nutes my room started to dial in.
My last harvest netted me .81 grams per watt, I am trying to get the allusive 1 gram per watt.