热泵型空调器，制热时环境温度过低，空调能效比也降低，在较冷的冬天制热效果不理想，这是正常现象。对于无自动除霜的热泵型空调器，它使用的最低环境温度是零上5℃，低于这个温度就不制热或效果很差，这是因为外部换热器上积霜堵住了空气流动，不能再从外界吸入热量的缘故;对于有自动除霜的热泵型空调器，它使用的最低环境温度也是-5℃，低于这个温度也不能有效制热。
Heat pump type air conditioner, when heating, the ambient temperature is too low, and the energy efficiency ratio of air conditioner is also reduced. The heating effect is not ideal in cold winter, which is a normal phenomenon. For the heat pump type air conditioner without automatic defrosting, the minimum ambient temperature is 5 ℃ above zero, and if it is lower than this temperature, the heat will not be produced or the effect will be very poor. This is because the frost accumulation on the external heat exchanger blocks the air flow and can no longer absorb heat from the outside. For the heat pump type air conditioner with automatic defrosting, the minimum ambient temperature is also - 5 ℃, which is lower than this temperature No effective heating.