Surface temperature varies depending on the mode of heat transfer. There is a system for simulating temperature and heat. She is resistant to pain and extreme heat and cold. Extended periods of heat and high humidity occur. Canberra has warm to hot, dry summers with heat waves. Summer&colon; Very hot, dry heat with little precipitation. During hot days, the metal would heat, causing pain. Thus, the surfaces heat the air above. Yellow combined with red symbolized heat and energy. There are millions of domestic installations using air source heat pumps. Adaptations include resistance to drought and tolerance of intense heat and sunlight. The steam is available for process heat. It is a good conductor of heat and electricity. Fouling occurs when impurities deposit on the heat exchange surface. In the north the surface layer (down to ) may heat up to .