 if you have it at 78, by the time it starts getting hotter, the air conditioning's on all the time when it's 78. If it was 73, it'd be on all the time. It's still going to be on all the time if it's 78. And it's 105 hours. And it depends on the system. If you have a two-cycle system, it can run on lower cycle. And again, it depends on your insulation, depends on which house or how many windows you have, what the windows are like, how old they are, which direction your house is facing.