i put mine back in, and it will probably stay there like Jon said. We had a cool weekend the week before the heat wave that sent my tank down to 72 degrees. (my sump is outside)...
So, no more. I have th heaters set to about 2+ degrees above the Aquacontroller is programmed for, so in the event the AC III dont work, the heaters will shut down on thier own, (I have three heaters, cuase that is what I have laying around the house to get up to 500 watts), (Each is set manually to a slightly different temp to come on or off as needed
Bill