Final answer:
Building codes mandate that sleeping room windows meet specific safety and energy efficiency standards, characterized by U-values and R-values, to ensure the safety and comfort of inhabitants.
Step-by-step explanation:
Building codes require that windows meet safety and energy efficiency codes for sleeping rooms. These codes ensure the safety of inhabitants, including proper ventilation and the ability to escape in case of emergencies. Windows in sleeping rooms are also required to meet certain energy performance standards, which are characterized by U-values and in the U.S., R-values.
For instance, a Passive House window would have a high R-value, indicating superior insulation properties and low heat transfer. In designing sleeping room windows, energy efficiency and safety measures are considered to protect against heat loss, ensure adequate sunlight, and enhance occupant safety.