Actually, the computer fans (available at Radio Shack) are very popular, since they are smaller, and are designed to run for long hours. You could easily wire it in to a temp controlled switch (like a thermostat), so that it kicked on when the temp was high but went off at lower temps. Be aware that this will dramatically increase the evaporation rate--you'll need to monitor it closely and add FW top offs more often. However, there are critters that will survive the higher temp--you may have serious problems locating them.