Yes, it has been pretty warm the last few days. The graph below shows how the high temperatures have affected the tank temperature over the past few days. No..we don't have air conditioning in the house.
You can see that it is hitting a bit above 81.5 F. That's only 2 degrees warmer than the operating goal of 79 F. The daily cycle is about 1 degree increase every 3 hours as soon as the halides come on.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank:
http://www.canreef.com/vbulletin/showthread.php?t=28436