G2 Gas Fitter Practice Exam

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What type of gas is often used in HVAC systems?

Natural gas
Propane
Butane
Hydrogen

The correct answer is: Natural gas

Natural gas is often used in HVAC systems primarily due to its availability, efficiency, and cost-effectiveness. It is a fossil fuel that is predominantly composed of methane, making it a cleaner-burning option compared to other fossil fuels. When used in heating applications, natural gas provides significant energy savings and lower emissions, which aligns with modern standards for efficiency and environmental sustainability. Its established infrastructure for distribution further enhances its practicality in residential and commercial HVAC systems. While propane also serves as a fuel in HVAC systems, especially in areas where natural gas lines are not available, natural gas is typically the more commonly used choice due to its widespread availability. Butane, although used in specific applications and portable heating devices, is less prevalent in HVAC systems because it requires higher pressure to transport and store. Hydrogen, while being explored as a future energy source, is currently not a standard fuel used in HVAC systems due to technological and infrastructure limitations. Hence, the choice of natural gas aligns with the most common practices in the industry.