Recently people lament that some of the hospital rooms have no aircon usually class C and class B. They feel that all should be aircon regardless of class. However, no aircon is good especially in hospital. Patients have weak immune system and usually feel cold in aircon room especially when the weather turns cool. Furthermore, in natural aired/fanned room, germs can easily dispersed instead trapped in the room. This is important as some germs are infectious and easily transmitted to other people. When you visit the TB treatment centre, there isn't aircon but many windows and fans. Nowadays everywhere is aircon and infectious diseases can easily spread to those with weak immune system. It's better to have nature ventilation and fan.