The 40 square living room of my house is installed with Haier KFRD 72LWC FS

40 square meters of your air conditioner must be no problem, not refrigeration may be not enough freon, power supply voltage is not enough, air conditioning power is not enough, the outside environment temperature is too high, the air conditioner is not cleaned and maintained for a long time, and the copper pipe connecting the indoor unit and the outdoor unit is too long.

If the room is well sealed, it depends on whether the temperature of the air conditioner outlet is normal.

The so-called set temperature is very deceiving. We believe this is the temperature recorded at the air outlet of 16 degrees Celsius, which is indicated by the manufacturer. My room thermometer was placed 6 meters away from the air conditioner, and after 3 hours of turning on the air conditioner and setting it to 25 degrees, the thermometer showed that the room temperature was 27 degrees.

The room should be kept closed or well isolated from the outside air, and the refrigerator is also a major source of heat indoors.

Lack of fluorine, insufficient evaporation pressure. The observation method can be used: the air conditioner is set to run in the state of high-speed air for cooling or heating, and the temperature difference of 10cm at the air inlet and outlet of the indoor heat exchanger is accurate when the amount of fluorine is accurate

>12 during refrigeration, >16 during heating; During refrigeration, all the indoor heat exchangers condense, the evaporation sound is uniform and low, the outdoor shut-off valve condenses, the condensation drips continuously in summer, and the connection between the indoor heat exchanger and the capillary is frost-free and dew-free. When heating, the wall temperature of the indoor heat exchanger is greater than 40.