When we use the air conditioners for heating in winter, we see that as the outdoor temperature is very low, the air outlet temperature on the indoor unit will be down as well. As a result of insufficient heating inside of the room. To solve this issue, many air conditioners have been equipped with an electric auxiliary heating function (EA heating). So, is this additional function practical?

 

1. What is electric auxiliary heating?

 

Electric auxiliary heating, short for "EA heating," is the function under the air-conditioning heating operation. When the outdoor temperature is deeply low or the indoor temperature rises slowly, the AC system will use electric heating components to heat, auxiliarily increase the air outlet temperature, and hasten the rising of the indoor temperature.

 

2. Pros of the EA heating

 

Fast heating: Under the extreme cold environment, the compressor working efficiency decreases, then the electric auxiliary heating can supply heat immediately and increase the indoor temperature to a comfortable level.

Improved comfort: It helps to avoid cold airflow, making the air warmer and more comfortable.

Extreme climate response: Under the temperature of below -5℃ or -10℃, a normal air conditioner may not be capable of heating, while the AC with EA heating would ensure a basic heating supply.

Reasonable price: Compared with purchasing a heater additionally, the air conditioning units with EA heating would be cheaper.

 

 

3. Cons of the EA heating

 

Higher energy consumption: The heating components have a low EER compared with a heating pump. If we rely on EA heating for a long time, the electricity bill will increase, apparently.

Unsuitable for long-term use: EA heating is better used as an emergent or auxiliary solution instead of long-term heating.

Comfort difference: Some EA heating design is simple; although it improved the air temperature, its overall comfort is not as stable as inverter heat pumps.

 

4. Comparison among normal heating, EA heating and ultra-low temperature heating pumps

 

Functions/Features	Normal AC heating	EA heating	Ultra-low temperature heating pumps
Working Principle	Heat pump cycle (Compressor heating)	Electric heating element auxiliary heating	EVI low-temperature enthalpy increase technology + high-efficiency heat pump
Applicable Temperature	≥ -5℃	≥ -10℃ (assisted starting at low temperatures)	≥ -25℃, even -30℃
Heating Rate	Medium, slower as temperatures drop.	Fast, noticeable temperature increase within minutes.	Stable and fast, even in extremely cold environments.
Energy Efficiency	High efficiency (high COP value)	Low energy efficiency, high power consumption	Efficient and energy-saving, suitable for long-term use
Comfort	The temperature fluctuates with outdoor temperatures.	The airflow is warm but dry.	The airflow is gentle and stable, providing a high level of comfort.
Electricity Cost	Relatively economical	Significant increase (long-term operation is expensive)	Long-term operation saves energy.
Suitable Customers	Southern regions/regions with less severe winters	Short-term heating in cold regions	Long-term heating needs in cold and high-altitude areas.
Typical Applications	Daily heating for ordinary households	Emergency or rapid heating	For home heating, villas, commercial use, and the Nordic/Russian market.

 

5. People available of EA heating

 

Cold and high-altitude areas citizens: Northeast China, Inner Mongolia, Russia, and Northern Europe, where the temperature in winter is often below -10℃.

Families that need fast heating: Getting up in the morning or back home after work, we need fast heating for a warm environment.

People who need an economic plan: Compared with individual heaters, an air conditioner with EA heating is a cost-effective choice.

 

EA heating is absolutely practical. If the area you live in often keeps a temperature below 0℃ in winter, then it's better to choose the air conditioner with ultra-low temperature technology. Combined with EA heating, this ensures both energy savings and comfort in extreme conditions.