It costs a lot of money to buy an air conditioner at one time, but it is more energy-saving and can warm the whole room. However, air conditioning heating also has a disadvantage. The outdoor temperature is low and the heating effect is poor. A heater like Little Sun is cheaper, but it costs more electricity to use, and it can only be heated in a small area. However, Little Sun also has advantages and is not affected by outdoor temperature. To be healthy, it is healthy to open the window often for ventilation, otherwise it is unhealthy. Choose according to your actual situation.