I am writing from experience. If you want your home to sell more quickly keep it heated to at least 65 even in the winter. People will not spend as much time in your home if it is cold and even though the sign says “Please remove shoes” some folks will refuse if the floor is too cold.
Saving $50 to $100 on your monthly heating bill isn’t worth having to make another months mortgage, tax and insurance payment because your home is still on the market because no one wants to stay in it long enough to fall in love with it.
Even in a strong sellers market the longer a home is on the market the lower the ultimate sale price will be. Keep your home at a comfortable temperature and you will make more money with a faster sale.