The true ideal temperature to keep your home during the winter will depend on what makes you comfortable.
But the lowest temperature you should set your thermostat during the winter would be around 68 F for heating costs savings.
Some people feel comfortable at 68 F in the winter while others may feel too cold at that temperature.
I keep my thermostat set at 75 F during the day but turn the thermostat down to 68 F at night when I'm asleep and warmer under the blankets.