I can believe as a one-to-one comparison, cooling an office is more efficient. But people aren't turning off their home AC when they go into the office. If you figure that a majority of people won't even schedule their thermostat due to laziness, having other people at home, etc, and if even if they do, having their house cool down for their arrival home (5:30-6PM?) is still during a pretty hot time of day.

I would be pretty surprised if offset you could anywhere near the cooling of an entire office building considering all that.

I'm coming from the perspective of Texas where it's 100F effectively all day during the summer and I wouldn't move the thermostat from it's usual daytime setting of ~76F past maybe ~80F. Any more and it would take hours to cool back down.