There is no federal Occupational Safety and Health Administration (OSHA) regulation that requires employers to maintain a certain workplace temperature. However, employers must stick to health and safety at work law, including keeping the temperature at a comfortable level and providing clean and fresh air. The minimum temperature in an indoor workplace should normally be at least 16°C or 13°C if much of the work involves rigorous physical effort. The U.S. Department of Labor enforces federal laws and standards for workplace and employee safety, and the minimum temperature for indoor workplaces is 68 degrees Fahrenheit and the maximum is 76 degrees Fahrenheit. The Approved Code of Practice on the Workplace (Health, Safety and Welfare) Regulations suggests the minimum temperature for working indoors should normally be at least 16°C or 13°C if much of the work involves rigorous physical effort. OSHA recommends that employers keep the thermostat between 68 and 78 degrees Fahrenheit to protect employees from having to work in uncomfortable temperatures.