Avoid direct airflow, add humidity, and don't abruptly expose babies to outdoor temperatures.

Using air conditioning in crowded rooms can easily spread respiratory illnesses. If I use a fan instead, will my risk of getting sick decrease? (Tran Nam, 42, TP HCM)

When your electricity bill skyrockets, you might blame the scorching heat and constantly running air conditioner, but you could be making costly mistakes.

I easily get a sore throat, cough, and stuffy nose when I enter an air-conditioned room immediately after being in the sun. What is the reason? (Duong Minh, 31, Can Tho City)

I have chronic sinusitis. When I use the air conditioner at work, my congestion, itching, and pain worsen. Why is this, and what can I do to alleviate the symptoms? (Linh Han, 35, Ho Chi Minh City)