Chicago stands apart from many other American cities due to its prolonged heating season (from October to May), which elevates the role of central heating in building design. The extended period of the heating season stresses on the significance of reliable heating solutions for homes and offices throughout the windy city. It’s why Chicago’s heating industry is unique in character compared to other metropolises in the country. The heating landscape in Chicago has been shaped by a fundamental choice between condensing and non-condensing boilers. This decision influences both new constructions and heating upgrades in existing homes. Fueled by natural or propane gas, or oil, these boilers eschew the traditional method of boiling water, opting to efficiently heat it. The heated water is then directed to various heating components, including radiant floor tubes and radiators, offering a modern and compact solution for heating needs. Condensing boilers are also surprisingly environmentally friendly as they have a lower carbon footprint on average. They also recycle exhaust gas through a condensing heat exchanger, curbing CO2 emissions. In contrast, non-condensing boilers waste a significant portion of generated heat as combustion gases escape through the flue at a higher temperature. Condensing boilers outshine their non-condensing counterparts in energy efficiency, boasting an impressive 99% efficiency compared to 78% at best for non-condensing options. The long-term cost efficiency of condensing boilers offsets their higher initial cost. Their well-sealed insulation ensures a pollution-free system and as an added bonus make Chicago a positive case study for how to approach city-wide heating through sustainable building practices. Chicago is also one of the first cities to mention heating efficiency in its building codes as it establishes minimum standards for all types of boilers. Regular inspections are mandated in order to ensure compliance with these standards and maintain its heating infrastructure.