Thermal Engineering is a specialised sub-discipline of Mechanical Engineering that deals exclusively with the conversion of heat energy between mediums and into other usable forms of energy. Almost all of the energy generated from thermal sources can be converted into chemical, mechanical or electrical energy depending on the purpose.

In order to convert thermal energy into another useful form, Thermal Engineers must be experts in heat transfer. Thermal Engineers are not limited in areas of specialisation and can choose to work in various fields including solar heating, boiler design or in Heating, Ventilation and Air Conditioning (HVAC) systems for small and large-scale residential, commercial and industrial buildings.

Common industries that regularly employ Thermal Engineers includes power companies, the automotive industry and commercial construction. Thermal Engineers generally work in an office but are often required to travel to factory locations or to the site of their current projects.