First, the energy efficiency ratio

The energy efficiency ratio of air conditioning is low, the power consumption is serious and the heating speed is slow. Li Aixian, an expert in the field of energy conservation at China National Institute of Standardization, reminded that there are still some air conditioners that claim to achieve a very high energy efficiency ratio in order to publicize the energy-saving effect, but they may not save money for consumers. This is not only because the higher the energy efficiency ratio, the more expensive it is, but also because most air conditioners are bought in winter for heating. At present, the energy efficiency ratio is only an assessment of air conditioning and refrigeration, and does not involve heating. Limited by its heating principle, air conditioning has many shortcomings in heating: when electric energy is converted into heat energy, the loss is large and the thermal efficiency is low. The heating energy efficiency ratio (the ratio of heating capacity to total input power) is usually less than 2.5. When the outdoor temperature is lower than 0 degrees Celsius, its energy efficiency ratio rapidly drops to 1, which is only equivalent to an electric heater. The lower the outdoor temperature, the worse the heating effect of the air conditioner.

It will be very difficult to start the air conditioner below-15 degrees Celsius. The winter in the north is long, and the cold period in most areas is below-15 degrees Celsius, so the heating effect of air conditioners will be greatly reduced. No matter how low the temperature is, whether indoors or outdoors, the electric heater can be used normally and the temperature rises quickly.

Second, the balance between air and water.

Air conditioning heating is not smooth, dizziness and chest tightness follow. Electric heaters use water to keep warm, which is most in line with the theory of preventing air drying in traditional Chinese medicine.