The company can turn on the cold air conditioner in hot March.

If it is hot in March, you can definitely turn on the air conditioner, which is normal. Of course, local regulations are different. Some companies make it clear that they can't turn on the air conditioner for the time being, as long as they pay enough electricity, they can turn on the air conditioner normally. According to your personal situation, you can also ask the opinions of most people, or in some places, it is clear that you can't turn on the air conditioner in March, or you can open the window for ventilation, which can also alleviate the problems caused by hot weather. Ventilation by opening windows can also help to improve indoor air quality, or turn on the exhaust fan to keep the room dry, which needs a lot every day.