There are many rational, emotional, and medical reasons for transferring patients from intensive care units to hospitals and providing critical care at home. So what about a critical care patient? A patient who is no longer critically ill but still needs an ICU facility and her ICU care. Some patients at the end of life can still benefit from being sent to a home where critical care services can be provided alongside home care. Long stays in the ICU increase the risk of nosocomial infections and may delay the initiation of rehabilitation treatment. Therefore, those in need of critical care are essentially those recovering from long stays in the ICU, those with neurological disease, those with spinal cord/brain injury and/or multiple traumas, those after transplant, those with a terminal illness, and those with a terminal illness. Patients, cancer patients, and patients with respiratory disease. With terminally ill patients, and patients undergoing ventilators and tracheostomy, to name just a few, automation of building systems reduces administrative effort and saves energy. However, in healthcare, maintaining certain parameters in certain spaces is essential to ensure optimal care. Automated control systems easily meet critical space environmental requirements, providing a safer, healthier space for patients and physicians. Healthcare facilities have multiple areas where environmental factors must be tightly controlled, including maintaining air quality, temperature, pressure, humidity, and more. Meeting these requirements can be challenging, but facilities must maintain consistency in these critical environments for the health and safety of their patients and staff. For example, operating rooms must maintain spatial and airflow cleanliness that reduces transmission of pathogens. An automated control system that creates airflow that prevents germs from moving out of the room is critical to keeping the rest of the hospital sanitary. Another example of critical environmental requirements is hospital rooms that must maintain specified humidity and temperature for patient comfort and high indoor air quality. The isolation room must provide fresh air to the patient and prevent air from leaking into the hospital. Indoor air quality in healthcare facilities can directly affect the health and well-being of everyone in the building. For example, uncontrolled pathogens spread through HVAC systems can result in increased staff sick days and patients suffering from secondary infections. In critical environments, it is necessary to prevent the spread of infectious agents. Maintaining proper air exchange ensures a constant flow of fresh air to critical environments in healthcare facilities. In places where indoor air must be introduced, such as laboratories and operating rooms, air exchange must provide a safe way to ventilate the room without exposing the rest of the facility to contamination. Options include creating air curtains and pressure differentials, or using airflow and filtration to protect the entire facility from internal air pollution. The ANSI/ASHRAE/ASHE 170-2017 regulation establishes certain minimum air changes per hour and whether critical environments are allowed to be vented to the outside. There are two metrics for hourly ventilation (ACH), which are compared as equal minimum outdoor ACH and minimum ACH. For example, depending on the laboratory type, the air can be expelled to the outside with 6 to 10 air changes per hour. Other critical environments, such as operating theaters, require 20 air changes per hour to minimize the flow of fresh air into the room, of which 4 or more are complete with outside air.