I just leave mine in the 60-64 range (or however close the old honeywell is for accuracy). Usually cycles once or twice in the morning. but the sunlight heats the house up to 73 during the day... unless that thermostat is way borked.
2003 gmc 1500hd quadrasteer "Miley"
2000 jeep cherokee "Herman"
1977 Ranger 150a bass boat
1987 Yamaha Moto 4 quad