I don't need to mess around with our thermostat because we have a programmable one. We keep the house fairly cool anyhow, so as the house warms up due to warmer weather outside, it just goes on less often.
I keep the thermostat set at 60 so when the temps outside hits 60 and stay that way I turn off the system. We have small space heaters for our rooms and will use those at night. Once the day temps stay above 65 we start opening the doors and windows during the day to get air moving thru the house. This will usually happen by mid-March. I wait to start the AC until temps in the house climb above 82.