a method of conserving energy during a heating event wherein a coolant is heated in a cooling system is disclosed . the method includes establishing a first set point temperature for a first point in the cooling system and establishing a second set point temperature lower than the first set point temperature for a second point in the cooling system . normally , the coolant is maintained at the second set point temperature at the second set point in the cooling system . during the heating event , the second set point temperature is raised to substantially match the first set point temperature to reduce necessary heating of the coolant at the first point .