It all depends on how efficient is your heater. My house is 10% larger than yours and it has vaulted ceiling in the living room, so it takes even more energy to heat, during the winter, I set my house to 70 during the day and 72 at night 24/7, and the cost of running the heater (gas and electric) is ~$80-$100/month more than when I turn it off. It’s totally worth it to be able to walk around the house in shorts and t-shirt every single day of the year.
