The heat generator is a key member of HVAC system components when it comes to heating. What happens in these devices is, for example, the production of heat through the extraction of fuel energy inside a furnace, aka a combustion chamber.
The hot flue gases will then provide heat for air or any other fluid such as water which will then heat the air entering the conditioned environment. Electric heat generation can also be used to heat the conditioning air.
While there may be many options for heat generators, the most common forms are furnaces, and therefore, environmental concerns regarding these HVAC system components are important to consider for resource control and combustion efficiency for pollutant emissions. Combustion efficiency is the proper and complete reaction of fuel with oxygen inside the furnace so that no fuel is wasted.