The fumes from a properly functioning air conditioning unit should not be dangerous to breathe. Air conditioners do not produce fumes as part of their normal operation. However, there are a few considerations to keep in mind:
Indoor air quality: Air conditioners help improve indoor air quality by filtering out dust, allergens, and other pollutants. However, if the air conditioning system is not well-maintained, it can accumulate dirt, mold, or bacteria, which can then be circulated into the indoor air. Regular maintenance, such as cleaning or replacing filters and inspecting the system, is important to ensure clean and healthy air.
Chemical refrigerants: Air conditioners use refrigerants to cool the air. Older air conditioning systems may use chlorofluorocarbon (CFC) refrigerants, which have been phased out due to their harmful impact on the ozone layer. Modern air conditioners typically use hydrochlorofluorocarbon (HCFC) or hydrofluorocarbon (HFC) refrigerants, which have lower ozone-depleting potential. While these refrigerants are generally safe when contained within the system, if there is a refrigerant leak, it's important to have it addressed promptly by a qualified technician.
Regarding your second question, it is not recommended to have an air conditioning exhaust in a closed room for several reasons:
Limited fresh air supply: If a room is completely closed off, the air conditioner's exhaust will not have sufficient fresh air to draw from, leading to a decrease in air quality and oxygen levels within the room. This can cause discomfort, drowsiness, or even health issues.
Inadequate ventilation: Proper ventilation is crucial for maintaining a healthy indoor environment. Without sufficient air exchange, pollutants, odors, and excess humidity can accumulate, leading to poor air quality, mold growth, and potential health risks.
Overheating: As you mentioned, an air conditioning unit exhausts hot air. In a closed room, this hot air will accumulate and can lead to overheating, which can be uncomfortable and potentially dangerous, especially in confined spaces.
To ensure the safe and efficient operation of an air conditioning unit, it is recommended to have proper ventilation in the room or space where it is installed. This includes ensuring that there is adequate fresh air supply and allowing for proper exhaust ventilation to remove hot air from the area.