What energy source can be combined with a heat pump in a dual fuel system to optimize efficiency?

In a dual fuel system designed to optimize efficiency, combining a heat pump with natural gas is a practical choice because it allows for the use of two different energy sources depending on the conditions. Heat pumps are highly efficient for heating and cooling, particularly in moderate climates. However, when temperatures drop significantly, their efficiency can decrease, making them less effective.

By integrating a natural gas system, the dual fuel setup can take advantage of the more reliable performance of gas heating during colder weather while allowing the heat pump to operate during milder conditions. This approach maximizes energy efficiency and provides cost savings over the long term. Since natural gas typically offers a lower cost per BTU compared to electricity during winter months, this combination can be particularly beneficial for homeowners.

While other energy sources like electricity, solar power, and wind can work in varying capacities, they do not provide the same reliable backup for heating efficiency during colder temperatures as natural gas does in this context. Therefore, natural gas stands out as an optimal choice in a dual fuel system paired with heat pumps for maximizing overall system efficiency.