In the winter the temp is more constant, in the summer one day it may be 72 degs, the next 92, so you would be programing the stat every other day unless you want to maintain a constant 75 degress in the summer.If the high for the day is 98, and the stat is set at 75 the A/C will most likely run and never shut off not to mention never maintain 75.
I keep the stat usually 7-10 degress cooler than it is outside in the summer, unless the high for the day is somewhere in the mid 70's I turn off the A/C.
Tom