First, the heating effect is very fast. Generally, in a space of 40-50 square meters, it can reach 15-18 degrees in half an hour.
Second, after the air conditioner is turned on for a period of time, the moisture in the air is lost and the space is dry, while the fireplace directly blows air and does not take away the moisture in the air.
Third, we generally know that heat goes to higher places. The air conditioner is usually above the head of a person, so the upper body is very hot, but the lower body is not very hot and uncomfortable, while the fireplace starts to heat from the soles of the feet, warming up the whole body.