To prevent bacterial growth , hospitals combat bacterial growth with cold temperatures. Keeping temperatures cold helps to curb bacterial and viral growth, as bacteria and viruses thrive in warm temperatures. Operating theatres are often the coldest areas of a hospital to keep the risk of infection to a minimum. Bacteria thrive in warm environments, so hospitals combat this with cold temperatures, which help to slow bacterial and viral growth.
To combat this spread of disease and infection in the hospital room, cold temperatures and low humidity prevent condensation on sterilised surfaces, open wounds and surgical equipment. Moreover, patients can always ask for blankets when they feel cold, as their comfort is a priority for hospitals. By keeping temperatures low and the emergency room cool, it offsets the heat from the bright light, allowing staff to carry out their medical procedures comfortably and also allowing patients to be comfortable while being treated. In fact, cold air often prevents the spread of viruses, as cells cannot last as long outside the body.
As for why they keep hospitals cold, because most bacteria don't do well, it helps feverish patients and it is easier to wear an extra layer than to be too warm. Operating theatres are some of the coldest areas of a hospital, typically around 65-69° with 70% humidity, to keep the risk of infection to a minimum. Ultimately, emergency rooms are often cooler to make the hospital environment safer, healthier and better for everyone.