I use a Secret Jardin DRII 120 for flower. Great tent
I use a cheap Growgright off E-bay for veg. Works great for veg would not use for flower, to many light leaks.
A tent will not solve your heat issues. Need better Ventilation.
My ventilation is set up Carbon Filter then a wye, then through 2 a/c hoods, another wye, then my 6" Vortex Fan, to the window and outdoors. My intake is semi Passive coming from outdoors, I do have a fan installed for those really hot nights(I run my lights at night) that I turn on when needed.
If I would be having high temp issues, I would not grow DWC. Trying to keep the water temp cool enough will be problematic(DWC water should be in the 68 deg range), unless you got a chiller. I grow in soil when temp start to rise and go back to DWC in the Fall