Can air conditioner increase room temperature during winter?

Answer 1

Any heat you got by running an air conditioner in winter would be from the compressor motor, which gets hot because it is using electrical current to do work. In normal warm-weather operation an air conditioner compresses refrigerant, then allows it to expand rapidly, producing a cooling effect. The cooled refrigerant travels through tubing and warm room air is blown past the tubes, which cools the warm air while warming the refrigerant. The warm refrigerant flows outside where it dumps some heat before being compressed and cooled again.

Air conditioners dump heat gathered from a warm room. They do create some heat from the electricity they use. If you are trying to heat a cold room, you'd be better off putting the electricity to use running a space heater of some type.

Answer 2

An air conditioner works any time the thermostat is set lower than the ambient temperature and the air conditioner is turned on.

Answer 3

If the air conditioner is reversed by switching tubes leading to the evaporator and the condenser, the air conditioner becomes a heat pump and is capable of heating the home.