First of all, this Galanz air conditioner is not an inverter air conditioner. The way to turn on the heating is to press the red oval start button of the remote controller, then press the function key next to the display screen of the remote controller to adjust the cooling mode to the heating mode, then press the temperature "rise" button to raise the set temperature, and if the outdoor temperature is lower than five degrees, then press the electric heating button of the remote controller.