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Electricity or propane are commonly used heating systems in areas where natural gas is unavailable, making this the correct choice.

Electric heating systems can be utilized in various forms, including electric furnaces, heat pumps, and baseboard heaters. They are often favored for their convenience and ease of installation, as they can be directly connected to existing electrical infrastructure.

Propane, on the other hand, is a versatile fuel that can be used for heating through propane furnaces, boilers, or even space heaters. It is especially useful in rural areas where natural gas pipelines are not available, offering an effective alternative for home heating needs.

While solar energy has the potential to provide heating solutions, it typically requires significant upfront investment and is more variable and dependent on location and climate, making it less commonly relied upon for primary heating. Geothermal systems, while effective, are also less ubiquitous due to the cost and complexity of installation and maintenance, and wind energy is primarily used for electricity generation rather than direct heating. Only electrical heating, while possible, does not take into account propane as an available and effective alternative that is widely used in areas lacking natural gas.