I agree with Yuki, there is no need for heaters in the summer unless you air condition excessively.
But if you do, diesel hybrids suggestion of controller is on point.
When my heaters have failed 90% of the time its in the on position.
After a couple of those failures, I always replaced the high wattage units with 2 or 3 undersized heaters for my tanks, that way if 1 fails, the others turn off.
Besides most cichlids are good with mid 70s, especially those from the rift lakes where mid 70s are the very stable average.
But if you do, diesel hybrids suggestion of controller is on point.
When my heaters have failed 90% of the time its in the on position.
After a couple of those failures, I always replaced the high wattage units with 2 or 3 undersized heaters for my tanks, that way if 1 fails, the others turn off.
Besides most cichlids are good with mid 70s, especially those from the rift lakes where mid 70s are the very stable average.