EH是空调电辅热标志。指空调的PTC电辅热技术。理论上就是用额外的电加热增加制热量，效果上会明显好不少。
“辅助电加热的功能。打开空调遥控器的电辅热功能，空调就会通过电热丝和压缩机一起加热，尤其是在天气比较寒冷的时候，空调不太容易从外面获得热量，当打开空调遥控器电辅热功能之后，空调就会将电能转化成热能，从而让空调起到快速加热的作用。”
空调的电辅热技术是PTC电辅热技术。PTC是一种半导体发热陶瓷，当外界温度降低，PTC的电阻值随之减小，发热量反而会相应增加。
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