on my a7n8x-e deluxe it is showing that my case temp is 20C = 68F....my thermostat is set at 74....its is possible that the air could lose heat and become cooler? i ususally have my ceiling fan on high. it seems odd that my case temp is actually lower than room temp
Long answer: Hell no.... assuming your ac thermostat is accurate (and 100% heat transfer from cpu to case to room), the lowest your case temp could be is ambient.... and since 100% effectiveness is not possible, that can't happen. of course when room temp superconductors are cheap safe and available, that might just change... hehe.
a ceiling fan will move air around, but it doesnt actually lower temps. sounds like your case sensor is off by a bit....
Well, what might be happening is that the AC vent is nearly if not directly above your computer. That is the case in my room and when the ac is on the cool air drops in a column to the floor, since cool air sinks. Since the air coming out of ac is often a hell of a lot cooler than the rest of the room it could account for the lower temps compared to ambient if it gets sucked into the case before it spreads out to the rest of the room and warms up. I noticed a 3 to 4 drop in case temps once when my ac kicked in. I would hook that vent up to my computer if I wasn't still living with my parents, they'd have a fit.