Yes, Haeir AC can be used as a heater. Although not all AC can be used as heaters unless they are equipped with heat pumps. Haeir AC comes with a factory-fitted heat pump that can provide your room with the much-needed heat.
All you have to do is put your ductless haeir air conditioner in heat mode, and you will see how your room temperature will rise in no time. When you put your haeir air conditioner in heat mode, the temperature range is usually within 60°F - 86°F.