In Blue Diamond, the majority of urgent heating services attend to an assortment of heating systems, including but not limited to furnaces, boilers, heat pumps, and electric heaters. These service providers seem well-prepared to address a diversity of fuel types, including gas, electricity, and oil; offer a kind of specialized service that seems necessary when attending to different models and brands; and, generally, run a kind of business that instills confidence in the "average" customer. Yet, at the same time, there's a clear sense that relying on this "average" set of conditions can lead to potentially disastrous results when something goes wrong with a home's heating system.