Some other ideas would be to take ice and place it in ziplock bags and place on top of the tank, bakers style racks for the tanks to sit on (they will allow air to flow around the tanks helping cool them.) Like stated above i would invest in a portable AC and maybe a fan and run them during the day while the lights are off. Elevate the lights at least 3" from the top of the tank to allow air to flow between the light and the tank. Living in Texas the summer heat and humidity cause big problems for my frog room since the frogs i keep like it in between 70-80*F. And the outdoor Temps Exceeding 100+ degrees and humidity between 70-80 % .