Contrary to many popular books and public opinion, the math just doesn't support cooling off a tank with ice unless it's a nano. (I should don a flame retardant suit about now) If you're going to use ice anyway don't add ice directly to the water! Place it in ziplock bags or 2 liter plastic bottles and float them in your sump.
Plan A
Point the fans on the water unless you really are trying to cool off the lights. If you want to cool off the water then have the fans blow the air across the water. Be prepared for the increase in evaporation.
Plan B
Raise the temp setting on your heaters to 83 so that the temp fluctuation is minimized and just accept the temp instead of fighting it. 84, or even 86-87, is fine for a reef for a few months. The damage comes from the temp falling 3 or 4 degrees once the lights shut off.
Plan C
Switch your lighting time to nighttime when your house might be a little cooler.