Heat is an idea that most of us take for granted. Heat can be produced by burning fossil fuels, such as natural gas, propane gas, or fuel oil. In newer buildings, heat pumps are used to produce heat. Heat is essential for healthy indoor living. It keeps your body warm indoors when it is cold outside.
People can become very sick if exposed to extreme levels of cold climatic conditions.
Therefore, heat is not only a comfort indoors, but a tool to protect the body. People need to be comfortable with the temperature and humidity of indoor air. When the weather is hot and humid outside, most people seek comfort inside from air conditioning units. Air conditioning pulls air from outdoors and cools the air as it enters a house or building. HVAC systems provide thermal comfort through temperature and humidity control.