If you do this, use ice BLOCKS and NOT ice cubes. Just freeze large metal or plastic containers of water and use those instead of the cube trays. Last way longer.
My solution is to live in a ground floor suite (upstairs is way too hot), and have my front and back doors open from sunset till 3 AM or later (depends on how late I can stay up) in order to "trap" as much cold air as possible in my place to keep the tanks & myself at a nice, cool temperature. For instance, my car thermometer was reading 29 C all afternoon when I was out driving with the AC blasting, but my tanks never went above 23-24 C all day. I have a fan blowing in the room but if it gets really warm, I set up small clipon fans over the sumps to create more evaporative cooling effect. If it gets really hot in here (usually needs to be in the mid-30s outside), then I set up my 12000 btu portable AC unit to keep my tanks and myself comfortable. My family is in Malaysia right now where the average temp year-round is 32-33 C and its the hottest time of year right now. Glad I don't live there and try to keep sw tanks from overheating.