Air conditioning can significantly improve living conditions during hot weather, but improper use can harm the respiratory system, according to Master of Science, Doctor Dang Thanh Do of the Respiratory Department at Tam Anh General Hospital Hanoi.

**1. Setting the air conditioner below 20 degrees Celsius**

Setting the air conditioner below 20 degrees Celsius is a common mistake during heatwaves, as many families aim for rapid cooling. However, this excessively low temperature makes it difficult for the body to adapt, placing strain on the respiratory system. Extended exposure to such cold air increases the risk of developing bronchitis and pneumonia. For individuals with asthma, low temperatures can trigger bronchospasms, leading to coughing, wheezing, and difficulty breathing. It is advisable to maintain the air conditioner between 25-28 degrees Celsius and use a fan to improve air circulation and prevent overly localized cooling.

**2. Entering a cold room immediately after sun exposure**

Entering an air-conditioned room immediately after being in the hot sun is another frequent error. The body needs time to adjust to sudden temperature changes, and this abrupt shift can cause thermal shock and negatively impact the respiratory system. This is particularly true for sensitive individuals or those with asthma, who may experience airway constriction, leading to difficulty breathing or coughing. It is recommended to spend about 10-15 minutes in an intermediate environment to allow the body to gradually stabilize before entering a cooled room.

**3. Not opening room doors before and after using the air conditioner**

Keeping doors tightly closed while the air conditioner is running, a common habit to retain cold air, can lead to poor air circulation and diminished indoor air quality over time. This stagnant environment increases the risk of respiratory tract irritation, especially for sensitive individuals or those with pre-existing respiratory conditions. To mitigate this, families should open room doors for 15-30 minutes before and after using the air conditioner to enhance air circulation and reduce the buildup of harmful elements.

**4. Not cleaning the air conditioning unit**

Air conditioners accumulate dust, moisture, and mold within their filter systems and cooling coils during operation, creating an ideal breeding ground for microorganisms. Without regular cleaning, these contaminants can be released back into the room's air, significantly increasing the risk of bronchitis, pneumonia, and triggering asthma flare-ups in affected individuals.

**5. Not controlling humidity**

Air-conditioned rooms often have low humidity, which can disrupt the natural environment of the respiratory tract and impair its self-cleaning and protective mechanisms. Low humidity can lead to dryness and irritation of the airways, while excessive humidity encourages mold growth. This prolonged imbalance in humidity increases the risk of respiratory illnesses and can exacerbate symptoms in individuals with asthma.

*Thu Giang*